From the laptop the FBI is holding that the left doesn't want to talk about for some strange reason...
EXCLUSIVE: Joe Biden could become embroiled in the FBI's probe into Hunter's finances, experts say: Emails reveal they SHARED bank accounts, paid each other's bills and the president may have even have funded his son's 2018 drug and prostitution binge
It is not unusual to have two or more names on a bank account. This is for estate planning purposes, e.g. with a father/son listing, upon the death of the father the account can be immediately accessed as opposed to being unable to use the funds until probate is resolved.
What is unusual is that the actively shared the account as per the reference.