Bitcoin is a wonderful wealth inheritance. i guess you should inform and educate your family members how to use it. Educate them how to encash it. If you do not educate them, your bitcoins might be invested to scams like Bitconnect. Or they might seek advice to wrong people when you die. Must teach them properly.
Maybe not all of the family but he can tell his trusted family members and teach him/her about how to use bitcoin so he/she won't have a problem in the future. We can tell the family members, but we cannot force them to learn bitcoin or use bitcoin because that will be their decision to use bitcoin or not. But if one of our family members have a curious about bitcoin, that will be the right time to tell and explain everything that we know to them.