Joint ownership is used by millions for various reasons. When problems arise, they are usually unintentional and it can be too late to remedy them. For example:
Jane wants to avoid probate with as much of her estate as possible. She also wants her daughter, Sally, to have easy access to her cash at death to take care of last expenses. Jane thinks...she can do this by naming Sally on her bank accounts jointly.
On the surface, this looks like a quick and easy way to accomplish what she wants. It's what lies below the surface that can sink her financial ship.