Medical Oncologist
CION Cancer Clinics
Coordinating genetic testing across a large family | CION Cancer Clinics
In a large family, testing works best with one coordinator, a simple list and a clear order. Start with parents, brothers, sisters and adult children, then let each branch pass the news down its own line. The coordinator does not need to understand the genetics. This page explains who does what, what to track and what tends to go wrong. At CION Cancer Clinics, our team helps carriers and their families plan checks, next steps and support after a genetic result.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
How do you organise testing when the family is very large?
Pick one person to keep the list, start with the closest relatives, and let each branch pass the news down its own line. A large family does not need everyone tested at once. It needs a clear order, one shared copy of the result and a way to know who has been told.
Why large families get stuck
In a joint family with many brothers, sisters and cousins, everyone assumes someone else has passed the message on. Some relatives hear a garbled version. Others hear nothing for years. The problem is rarely the test. It is who says what, to whom, and when.
What a little planning changes
Families that name a coordinator and keep a simple list reach far more of their relatives. The coordinator does not need to understand the genetics. They only need to keep track, send the family letter and nudge gently when a branch goes quiet.
When the family is spread across India
Many Telangana families have branches in Hyderabad, in the districts, in other states and in the Gulf or the United States. Distance is not a barrier to testing. Each relative can see a counsellor where they live, as long as they carry the family letter. The coordinator simply needs a phone number for one person in each place.
The coordinator organises. The counsellor explains. Each relative still decides for themselves.Roles in the family
Who should do what?
Splitting the work stops one person carrying all of it, which is usually the person who has just been through cancer.
The person with the result
They hold the report and share it. They should not have to phone every cousin while recovering from treatment. Their job is to agree who may see the result, and to keep the original report safe. A photo on a phone is useful, but a paper copy should be kept too.
The family coordinator
Often an adult son, daughter or a trusted sibling. They keep the list, send the family letter and note who has seen a counsellor.
Good coordinators are
- Trusted by both sides of the family
- Organised, and comfortable on the phone
- Discreet with private results
A contact for each branch
One person in each branch passes the news to their own parents, siblings and children. This works better than the coordinator calling relatives they barely know.
The genetic counsellor
Explains the result, writes the family letter and answers questions the family cannot. Each relative gets their own appointment, near home or by phone. Counselling in Telugu can be arranged for relatives who would rather talk in their own language.
Not sure whether this applies to you?
Ask an oncologistA simple plan
What are the steps, in order?
Draw the tree with the counsellor
Mark every blood relative on both sides, who is living, where they live and how to reach them. The counsellor marks who is at risk and who comes first.
Get the family letter
Ask the counsellor for a letter naming the gene and the exact change. Make copies. Every relative who is tested needs it, including those in other states or abroad.
Tell the closest circle first
Parents, brothers, sisters and adult children hear first, ideally in person or by phone. Their results decide which branches come next.
Move out branch by branch
When a relative tests positive, their own children and siblings are told next. When a relative tests negative, their branch can usually stop there.
Check in after a few months
Look at the list together and see which branches have gone quiet. A gentle reminder often helps more than repeated calls.
Keeping the list
What should the family list record?
- Name and relationship
- Who they are and how they link to the person with the result, such as mother's younger sister.
- Side of the family
- Mother's side or father's side. This shows at a glance which branches are at risk.
- Told, and by whom
- Whether they have received the family letter, and which relative passed it on.
- Seen a counsellor
- A simple yes or not yet. Leave out the reasons unless they choose to share them.
- Result shared
- Only if they agree. Some relatives will keep their result private, and that is their right.
- Next branch to tell
- Whose children or siblings need the letter next, if this relative carries the fault.
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Side by side
What tends to work, and what tends to backfire?
Usually works
Usually backfires
A private call, then the family letter
Announcing it in a large family WhatsApp group
Each branch telling its own members
One person phoning everyone at once
Plain facts and a counsellor's contact
Your own reading of what their risk is
Letting each person decide in their own time
Pressing for a decision at a family function
Commonly believed
Four things large families assume
"Everyone should come in on the same day to save time."
Group testing days rarely work. Each person needs their own counselling and their own choice. Testing branch by branch also spares relatives who turn out not to need a test at all.
"The elders must agree before anyone else is told."
Respecting elders matters. But an adult sibling or cousin has their own right to know about a risk to their own health. Waiting for agreement can delay useful screening.
"Once everyone has been told, the job is done."
Children grow up, and relatives marry and have families. A good family list is kept and passed on, so the next generation knows the result exists.
"The coordinator should know everyone's results."
Only if each relative agrees. A coordinator can track who has been told and seen a counsellor without ever seeing a single result.
Being straight with you
What this page cannot tell you
It cannot tell you which of your relatives are at risk or in what order they should be tested. That depends on the gene and on the shape of your family. A genetic counsellor works it out with you, using the report and the family tree.
It cannot interpret anyone's result
What your specific variant means is a question for the counsellor who ordered the test. The coordinator should never be asked to explain a relative's result. Point them to their own counsellor instead. Two relatives with the same fault can receive different advice, because age, sex and personal history all change the plan.
Who this does not apply to
Most families do not need any of this. If no one has a confirmed pathogenic result, meaning a fault known to raise risk, there is nothing yet to pass on. If the result was a variant of uncertain significance, a change whose effect is not yet known, relatives are not usually tested for it. In small families, a direct conversation is often enough without any formal list.
Questions we are asked
Common questions about organising family testing
Who should be the family coordinator?
Someone organised, trusted on both sides and willing to keep private things private. It is often an adult son or daughter. It should not be the person who has just had cancer treatment, unless they genuinely want the role.
Should we tell everyone in the family WhatsApp group?
Usually not. A result is personal, and people react badly to hearing it in a group chat. Speak privately first, then send the family letter to each person. The group can be used later for general reminders if everyone agrees.
Do all relatives need to see the same counsellor?
No. Each relative can see a counsellor near where they live, in another city or even abroad. What matters is that they carry the family letter, so their laboratory looks for the right fault.
What if one branch of the family refuses to take part?
Give them the letter and leave the door open. Some relatives come back months or years later, often after a new diagnosis nearby. Pressing hard usually makes them less likely to test.
Can the coordinator book appointments for relatives?
They can help with the practical side, such as finding a clinic or arranging travel. The relative should agree to the appointment themselves and speak to the counsellor in person or by phone.
Should we keep a written record?
Yes. A simple notebook or spreadsheet listing who has been told and who has seen a counsellor is enough. Keep the actual report separately, and share it only with relatives who are being tested.
How long does it take to test a large family?
It varies widely. The closest circle often finishes within a few months. Distant branches can take much longer, and some never test. That is normal, and a partial cascade still protects the people who take part.
Where do we start?
Ask the counsellor who gave the result for a family letter and help drawing the tree. Then choose a coordinator. Call the CION helpline if you are unsure where a relative should go, and someone will point you to the right clinic.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
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Sources
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- NHS — Predictive genetic tests for cancer risk genes
- MedlinePlus Genetics — What is genetic testing?
- Cancer Research UK — Inherited cancer genes and increased cancer risk
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
Cascade testing: how a result moves through a familyThe order the cascade normally followsWhat to send a relative: the family letterThe document every branch will needTesting relatives who live in another stateFor branches spread across IndiaKeeping a family genetic record for the next generationSo the list outlives this round of testing
Talk to us
Not sure how to reach everyone in your family?
Tell us about the result and the relatives who may need testing. We will help you plan the order and find counsellors near each branch. One helpline serves every CION centre.