Deceased Father’s Bitcoin

So my father passed away in March and I found some Bitcoin of America receipts in his wallet. I’m trying to call to just inquire about his coins because I don’t know much about it since he never mentioned that he was into cryptocurrency. If you send them a death certificate or anything like that, do they do any sort of transfer of the coins or something? I’m sorry if I sound a bit ignorant about this, I just really don’t know much about cryptocurrency.