I got my 4 year old a disc (star tl) that has the batman emblem on it. This way he has his own disc when we play. We usually can get through 9 holes if we make sure he gets to throw too. I make sure it's not all about disc golf when he's there. We break and have bonding time too. Good luck with the kids! It's rough at first but if you can get them involved, it's easier in the long run.
In the bag: Purples and Pinks