How to Tell Your Children and Siblings — About a Genetic Cancer Risk

The conversation is usually less frightening to hear than you expect it to be to give. Telling a sibling or adult child that a genetic variant has been found in your family — and that there is a way to find out if they carry it too — is a piece of information, not a verdict. Frame it that way: 'I wanted to tell you because you have the option to know.' A genetic counsellor can rehearse the conversation with you before you have it, which most people find reduces the anxiety on both sides.

For most inherited cancer syndromes, genetic testing is not recommended in childhood and is typically considered once a person can give their own informed consent as an adult. Whether your specific variant changes this timing depends on the risk it carries — some variants carry a risk that begins earlier in life. Your genetic counsellor will advise based on the exact variant your family carries. What you can do now is tell adult or near-adult children so they have the information they need to make that decision when the time comes.

The clinical recommendation is the same regardless of how close your relationship is. First-degree relatives carry the same biological risk. You do not need to rebuild a relationship to pass on a genetic finding — a letter, a message through another family member, or a brief email is enough to give them the option. State what was found, that they may carry the same variant, and where they can get more information. What they do next is entirely their choice.

Absolute risk is your actual probability of developing a cancer over a lifetime. Relative risk tells you how much more likely you are compared to someone without your variant. Relative risk figures can sound alarming — 'three times higher', for example — but without knowing the starting probability they are hard to interpret. If the baseline risk is very low, three times that is still low. Absolute risk gives your actual number, which is what your genetic counsellor will use when advising on what screening to start and when. Always ask for absolute figures when making decisions about surveillance.

In India there is currently no dedicated legislation protecting against genetic discrimination in insurance equivalent to the laws in some other countries. The Digital Personal Data Protection Act 2023 covers personal data privacy more broadly, but whether genetic test results would be specifically protected in an insurance dispute is not yet tested in courts. The practical guidance from oncology teams in India is to avoid disclosing genetic results to insurers unless the policy terms specifically require it, and to read those terms carefully before testing. Raise this with your treating team and, if needed, a legal adviser familiar with Indian insurance law.

A genetic counsellor is a healthcare professional trained to explain genetic test results, assess what they mean for your family, and advise on the screening schedule that follows from a positive result. At CION, genetic counselling is part of the care pathway for patients with inherited cancer variants, and your team can connect you with a counsellor or refer you to a specialist genetics service. Trained genetic counsellors are also available at several major cancer centres across India. Their role is practical: they help you understand your result, plan the surveillance it warrants, and prepare you for family conversations like the one this page is about.