christeeny, do it! what a wonderful opportunity, and i bet he'll do just great. you might get a little bit full but i don't think you'd need to pump unless you wanted to.
i haven't left linc yet for a whole night but i might if i were in a situation like you were... i'd be fine leaving him all night with his dad for sure, and i bet he'd be ok with one of his siblings, too. now you've got me thinking about it... a whole night's sleep! maybe i'll ask for that for christmas, just permission to curl up in bed for eight hours, with my earplugs and eye mask and down comforter...
he'll be really happy to see you, but i bet both he and your ILs will have a blast. go for it, girl!
sometimes when we're nursing, i'll "pull off" one of linc's toes and pretend to eat it, saying "pop!" well, dh said that this morning, during his diaper change, linc "pulled off" his own toes, saying "pop!" while he did it!
also, my 15 y.o. daughter taught him how to say "doot doo doo-doo doot!" when she says "mahna mahna" (think muppets).
he's standing in one place and sort of bobbing up and down, kind of a pre-flight check for learning how to jump, we think.
he's really enjoying all the christmas things... lights, trees, presents, stockings, and especially destroying the little paper creche figures i have. the little angel bell candles aren't in very good shape anymore, either. oh well!
hugs to all,