<prompt> Human: Not entirely sure if this is the place to ask about this but, I have a decent sized savings account with a bunch of stocks which my dad maintains and all of that. I recently noticed that the cash value of my account has been cut in half while the overall value has remained the same. I have very little knowledge about how trading works and all that but I get the basics. Looking at my account history hes been trading the bank money I have and buy large sums of US Treasure Bill 18U stuff. These are 3 month T-bills.x200B;x200B;My question is, what possible reason is there for doing this? I looked it up and the T-bills only have a 1 return on them, so in terms of investing that large of an amount of money it doesnt seem terribly productive. He is also doing this with my sisters account aswell. He has not told us about this at all. I dont want to jump to conclusions about anything but Im struggling to understand this at all. He has never done this with our savings before.x200B;  <response>: You are apparently 24 years old.There is no reason your father needs to have power of attorney over your accounts. You should work with him to get this revoked. You could do it unilaterally, but no need for it be confrontational. 