Let's be realistic, I've heard enough of this 'don't let them know', how are you going to make it possible? I don't have this much of Bitcoin but everyone in my family knows that I am into crypto trading and investing, the only way they won't know is if you are not working at home and online, maybe you started your money making journey with a business and you silently start investing in crypto.
If there is no way you can use BTC without your family knowing, then you should also tell them about the risks of using BTC, which includes the risk of a $5 wrench attack, so they should not go about telling people that you have BTC if they don't want to be tied alongside you as criminals torture you to send them your coins.
I can't watch my cousins going through hard times and not teach them about crypto because in the end I will be the one they will come to for help.
Telling people about crypto would not change their financial situation if they don't have money to buy BTC, or if they don't have knowledge and skills that they can offer for BTC or crypto.