Talking with family about genetic risk

What do other families do?

A French genetics department followed 30 at-risk relatives seen between 2004 and 2017 and asked them about it afterwards. The researchers found that families often treated the disease as something not spoken about. Some relatives did not know they were at risk at all, and some people who had been tested kept their result to themselves.

The patterns were not random. People who learned they carried the family gene change often did not tell their parents, while they did tell brothers, sisters and more distant relatives. People who learned they did not carry it usually told a widowed parent, to reassure them, and found it harder to tell their siblings.

Knowing that these patterns are common can help. If you have been avoiding a conversation for months, you are not unusual or failing at this.

Who needs to know?

That is yours to decide, and a counsellor will help you work out who, when and in what order rather than giving you a rule.

One thing is worth thinking about in advance. Published practice guidance notes that in these families one person’s result can reveal something about relatives’ situations, because of how the gene is passed on. Telling a sibling your result tells them something about theirs. That is a reason to think about timing, and not a reason to stay silent forever.

Equally, anyone has the right not to be told. If a relative says they would rather not know their own risk or your result, that is a recognised position, and the right not to know covers it.

What about children?

In the French group, neither of the two carriers who had children had told them. Among people who had learned they were not carriers, children were told in 5 of 7 cases, some of them under 10.

Published frameworks are clear that predictive testing is not offered to people under 18, so this is a conversation about information rather than about testing. What and when to tell a child is usually worked through with a counsellor, who can also see the child’s parents more than once, and the answer tends to change as children get older.

What if relatives want different things?

This is common, and it can be genuinely painful: one person wants to be tested, another does not want the subject raised, a third wants everyone tested at once.

Nobody has to justify their own decision to the rest of the family. A counsellor can see different family members separately, which is often the practical way through when positions are far apart. Guidance from an expert panel in 2026 lists family dynamics, including guilt and secrecy, among the matters that counselling should address directly rather than leave to families alone.

Does it get easier after testing?

Not necessarily, and it is worth knowing that before you decide. In the French study, anxiety was common among people who had learned they were not carriers and among those who had not tested, and the authors recommend that counselling say clearly beforehand that a result showing someone is not a carrier does not resolve everything the illness has caused in a family. The numbers are small and the study looked at people at one point in time, so this is an honest warning rather than a prediction.

Support in its own right helps, for carriers, non-carriers and untested relatives alike. Finding a counsellor lists routes to emotional as well as genetic support, and support groups can put you in touch with people who have had these conversations already.

How do I start?

Many people find it easier to start with the facts rather than the feelings: that the condition is in the family, that it is caused by a change in a gene called PRNP, that one changed copy is enough and that a parent who carries it has a 50 percent chance of passing it to each child. Inherited prion disease explained is written to be shared, and some families send a page rather than open the subject in person.

You do not have to do it all in one conversation, and you can ask a counsellor to help you plan what to say.

Where next?

Genetics and family risk is the hub for this section, genetic counselling comes first explains the appointments, and PRNP variants covers what is known about the individual gene changes.

Nothing here is advice about your own family. Questions about who to tell, what a result means for relatives, and how to approach a particular person belong with a genetic counsellor, who does this routinely.