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CION Cancer Clinics
Talking to your family about genetic risk | CION Cancer Clinics
If a test has found a cancer gene fault in you, your parents, brothers, sisters and children may carry it too, so most genetics teams encourage you to tell them. You choose who, when and how. This page explains which relatives the result matters to, how to prepare, the beliefs that often get in the way, and what to do when a relative does not want to know. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
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Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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On this page
- Should you tell your family about a cancer gene result?
- Which relatives does the result matter to?
- How do you prepare for the conversation?
- What do families often believe about gene results?
- What do the words in a genetics letter mean?
- What if a relative does not want to know?
- Common questions about telling family about gene risk
The short answer
Should you tell your family about a cancer gene result?
Most genetics teams encourage you to tell your blood relatives, because a gene fault found in you may also be sitting in them. How you tell them, when, and in what words is your choice, and you do not have to do it alone.
Why your result is also their information
Faults in genes such as BRCA1, BRCA2 or the Lynch syndrome genes are passed down from a parent. If you carry one, your parents, brothers, sisters and children may carry the same one. A relative who knows can choose to be tested. A relative who does not know cannot make that choice, and may only find out when a cancer is diagnosed.
What the result does not mean for them
A gene fault raises the chance of certain cancers. It does not mean a relative has cancer, or will get it. It also does not decide what anyone should do next. Some carriers choose regular checks, some choose risk-reducing surgery, and some choose to wait. Each adult makes that decision with their own doctors.
Why it often feels so hard
In many families, cancer is still spoken about quietly. People worry about blame, about frightening elderly parents, and about what a result might mean for a younger relative's marriage. These worries are real and common. They are a reason to plan the conversation, not a reason to keep the result hidden for years.
Ask your genetics team for a written summary of your result. It is far easier to share a letter than to remember a gene name correctly.Who needs to know
Which relatives does the result matter to?
The genetics team will usually start with the people closest to you by blood, then work outwards along the side of the family the fault came from.
Brothers and sisters
Each full brother or sister has the same chance as you had of inheriting the fault from the parent who carries it. Brothers matter as much as sisters, even when the family cancers were in women.
Your children
Each child of a carrier has a one in two chance of inheriting the fault. Whether and when a child is tested depends on the gene.
Usually
- BRCA and Lynch: testing waits until adulthood
- FAP and MEN2: testing is offered in childhood
Your parents
Testing a parent can show which side of the family the fault came from. That tells the team which aunts, uncles and cousins to think about next.
Aunts, uncles and cousins
Relatives on the side the fault came from may also carry it. They are often the hardest to reach, and the ones most helped by a clear written letter.
Relatives by marriage do not share the fault.Not sure whether this applies to you?
Ask an oncologistBefore you speak
How do you prepare for the conversation?
Understand your own result first
Make sure you can say the gene name, which cancers it affects, and what options exist. If you are unsure, ask your genetics counsellor to explain it again before you tell anyone else.
Decide who to tell first
Many people start with the relative they trust most. That person can then help you speak to parents, elders or relatives you rarely see.
Choose a calm time and place
Avoid weddings, festivals and hospital corridors. A quiet visit or a planned phone call gives people room to ask questions and react.
Give them something to keep
Share the family letter or your report. Tell them it is fine to take time, and that testing is their choice. You are passing on information, not asking them to decide today.
Commonly believed
What do families often believe about gene results?
"Men cannot carry a breast cancer gene."
Men carry and pass on BRCA faults exactly as women do. A father can pass a fault to his daughter. Men who carry one also have a raised chance of some cancers themselves, including prostate cancer.
"My mother never had cancer, so it cannot be from her side."
Many carriers never develop cancer. A fault can pass quietly through a parent who stayed well. Testing, not the family story alone, shows which side it came from.
"Somebody must be to blame for this."
No one chooses the genes they pass on. A parent who carries a fault did nothing wrong, and neither did you. Saying this out loud early often changes how the rest of the conversation goes.
"If we test the children now, we can protect them sooner."
For most genes, nothing changes for a child until adulthood. Testing is usually left until they can decide for themselves. FAP and MEN2 are exceptions, because checks or surgery can be needed young.
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Words you will hear
What do the words in a genetics letter mean?
- Carrier
- A person who has the gene fault. It raises the chance of some cancers. It does not mean they have cancer.
- Pathogenic variant
- A change in a gene that is known to raise cancer risk. Older reports call it a mutation.
- Variant of uncertain significance
- A change whose effect is not yet known. Relatives are usually not tested for it, and it is not treated as a fault.
- Cascade testing
- Testing relatives, one circle of the family at a time, for the fault already found in you.
- First-degree relative
- A parent, brother, sister or child. They share about half your genes.
When it does not go well
What if a relative does not want to know?
Some relatives will not want to hear it, and that is their right. You can offer the information once, clearly, and leave the door open. You do not have to keep pushing, and you are not responsible for what they choose.
When the reaction is anger or silence
Fear often comes out as anger. A relative may say you are spreading bad news, or refuse to talk. Give them time. Many people come back to the question weeks or months later, often when something else happens in the family.
When elders ask you to keep it quiet
Sometimes an elder worries about a daughter's or niece's marriage and asks that nobody be told. That concern deserves respect. It is still worth explaining that an adult relative who does not know cannot choose checks that might find a cancer early. A genetics counsellor can help you talk through this.
What this page cannot do
It cannot tell you what your relatives should decide, or which test suits them. Each person needs their own counselling, and the plan for a carrier depends on the gene, their age and their own health.
If a relative lives in another city or abroad, they can take your letter to a genetics service there.
Did you know
A relative does not need to repeat the full gene panel you had. Once the exact fault in your family is known, they can usually be tested for that one change, which is simpler to read.
Questions we are asked
Common questions about telling family about gene risk
Do I have to tell my family about my result?
No one can force you, and your result is private. Most genetics teams do encourage it, because relatives may carry the same fault and could choose checks or testing. You can decide who to tell, when, and how. Your counsellor can help you plan it, or prepare a letter you can hand over.
Can the doctor tell my relatives for me?
Doctors usually do not contact your relatives without your permission, because your result is confidential. What most teams can do is write a family letter explaining the gene and the testing on offer. You pass it on, and relatives take it to their own doctor or genetics service.
How do I tell my elderly parents without frightening them?
Keep it simple and calm. Explain that a test found a change that runs in families, that it is nobody's fault, and that knowing helps younger relatives. Bring a trusted sibling if that helps. Testing a parent is useful to the family, but it is still their choice.
When should my children be told?
Many parents wait until a child is old enough to understand, often as they approach adulthood, because testing for most genes is not done before then. For FAP or MEN2, checks may start young, so the team will guide you on timing. A counsellor can suggest words suited to your child's age.
Will telling my family affect a sister's marriage prospects?
This is one of the most common worries in Indian families. A gene result is private medical information, and each adult decides who they share it with. Knowing can also help a sister make informed choices about checks and family planning. Our separate page on preventive surgery and marriage covers this in more depth.
My brother says men do not need testing. Is he right?
No. Men can carry the fault and pass it to their daughters and sons. Men with a BRCA fault have a raised chance of prostate cancer and male breast cancer, and Lynch syndrome affects men's bowel risk too. Whether he gets tested is his choice, but he should make it knowing this.
What if my relative tests negative?
If they have been tested for the exact fault found in your family and do not carry it, their risk from that fault is usually close to the general population. Their children cannot inherit it from them. They may still need ordinary checks based on age and any other family history.
Can I get support for these conversations at CION?
Yes. Call the helpline and tell us what has been found so far. We can help you reach a genetics counsellor or a surgical oncologist who can explain the result, answer family questions, and write the letter you share. You are welcome to bring relatives to the appointment.
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Dr. Owais Mohammed
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MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
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Sources
- National Cancer Institute — BRCA Gene Changes: Cancer Risk and Genetic Testing
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- NHS — Predictive genetic tests for cancer risk genes
- NICE — Familial breast cancer: classification, care and managing breast cancer and related risks (CG164)
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Genetic Testing Before Preventive SurgeryWhat the test is and how relatives are testedPreventive Surgery and Marriage in Indian FamiliesThe marriage worry that stops many families talkingSurveillance Instead of Preventive SurgeryThe checks a carrier relative can chooseCaretaker and Family Guide to SurgeryHow relatives can support someone facing an operation
Talk to us
Not sure how to tell your family?
Tell us what has been found so far and we will help you reach a genetics counsellor or surgical oncologist who can explain it to you and your relatives. One helpline serves every CION centre.