Actually, since copyright is life + x years, an artist that wishes to leave his descendants with a source of income off of his works is better off creating a wo

Actually, since copyright is life + x years, an artist that wishes to leave his descendants with a source of income off of his works is better off creating a work and leaving it to them to slightly tweak and then publish as "by FAMOUS_ARTIST and his second cousin's daughter". That way, copyright will last for the life of the involved descendant as well. So I'm doubtful if anyone would publish anything just for the same of supplying for their children. It's just not the best way to achieve the goal.