The problem of course with this is the custodial platform can see every coin you own and every transaction you make using their platform. You might be able to hide all your other transactions from a cursory look by your family member as in OP's example, but you have zero privacy overall.
Indeed, I was focused on OP problem and I didn't mention this important detail. Thanks for doing so.
I think if you just want to hide your balance from a family member who isn't a tech guy, you can just transfer a small amount to another address and then make a second transaction to the family member.
I did think on this "method", but I decided to not tell it because if somebody learns to look onto block explorer, it may get (rather fast) to understand such an easy move and get to follow OP funds (of course, depending on how good OP uses different addresses for different purposes - but I expect the worse in this, privacy wise).