Contrary to popular belief, it is rarely a good idea to name parent and child as joint owners of a bank or investment account. Here is why:
If there is a legitimate reason to have a child assist a parent with management of a bank or investment account, the better alternatives to joint ownership are (1) Title account in parent's individual name and add child as agent under financial power of attorney, and (2) Title account in trust name and add child as co-Trustee. The only time when I would recommend joint ownership between parent and child is when they are operating a business together.
Thomas J. Bouman