Look, close family like your mother, father, brother, wife, child should have this information, in my opinion. However, I'd argue not disclosing it to the entire kinfolk. Like, okay, why should your brother-in-law know every little detail about you and cryptocurrencies? It's not he the problem, it's the fact that he may disclose it to people whom you would not approve of disclosing, and result into this thing none of us want to; becoming a target.
It's going to vastly differ for everyone. You might not trust even immediate family members, but almost everyone has someone they can trust. There's always that chance; where you might trust them to leave the Bitcoin alone, and only act upon it if something were to happen to you, but unfortunately if you don't want other people knowing you own Bitcoin, that could be harder to trust that someone doesn't mention it. However, you could just make that clear, and if people did find out, you just remove access since that was one of the requirements for trusting them.
I don't know though, blabbing about your Bitcoin probably isn't worth jeopardizing family. I feel like most people that are worth trusting, and you'd consider trusting in the first place would know that.
You can talk about your btc only to those friends and relatives to whom you are ready to give and leave it as a legacy. First you need to have a conversation with them with basic information about bitcoin, and even better, so that they learn how to use and store safely. These should be people you fully trust and will have access to btc in case of unforeseen circumstances with you.
There is an unspoken rule that you can invest in bitcoin only the money that you are ready to lose. I will try to continue this thought and say that you can give access to information about your bitcoin only to those people to whom you are ready to give your btc for free.
This is an indicator of personal trust and value of these people for you.