Does anyone know if I can use a proxy signature with all crypto coins, or only some of them might support it?

Here's the deal:

I want to buy a bit of a few popular cryptos for me and my family.

Now everyone in my family will have access to all the money, however if someone spends them I need to be able to identify who exactly has spent them.

Hence sharing the same private key with everyone would not be an option.

Anyone know if what I want can be done?