I've been saving what I think is a really great Free GM Resource just for this holiday.
I'm obviously a sucker for random table generators. I prefer to have the base tables so I can use my own generator of choice, Tablesmith, but I appreciate a good set of random tables.
Donjon RPG Tools is a great site with some awesome tables for several game systems. There are generic "Fantasy" tables, some AD&D tables, d20 Fantasy, 4E, and even some Science Fiction tables. I like how the site starts things off with a small random die roller function.
I hope you all have some fun with your families this holiday, but that you also get to have some fun with your gaming group, who for some are just another family.