cant think of its proper name but there was a simple game with cards where there were three sets, a) the heads b)the body and c) the legs. The proper idea was that you dealt out some cards to everyone and then had a pile in the middle with one turned up. You then took it in turns to take either the turned up card, or one from the pack and then put down a card from your hand. Your aim was to make complete sets so that you had the butcher the baker etc., but we loved being totally silly with it and our idea was what was the silliest or funniest set you could make, so you could have a soldiers head, a ballerinas tutu, and some roller skates. etc etc. A paper version was just that you draw a head on a piece of paper, fold it over and pass it on for the body to be put on next and so forth. How about pic a sticks? needs a steady hand and you can have teams and score if you like.
More of a board game have you looked at any of the Euro games ? Carcassonne is one I think would be a possibility with a mixed group, where you are trying to make up cities and collect various rewards etc etc., so you could perhaps have an adult and a child sharing . It might be too difficult if none of you know the basic rules. Good old snakes and ladders can still be fun too. Hope you find something you can all enjoy.