2 weeks to go and we're headed cross country for an 18 day 'vacation' to visit DH's extended family. Does anyone have and super awesome trips for road trips with kiddos?

E will be just shy of 2.5, and we're hoping the DVD player in the van coupled with some new toys for the ride will make the trip bearable.
A is going to be 5ish months, and I'm planning on pumping in the van so I can bottle feed her without having to stop AS often.

What has worked for you? Oh, and pray for us! lol! 18 days, 5000kms, 4 different hotels + 2 different family houses + family cottage, a 90th birthday party, a wedding and DH's entire family is going (FIL + MIL + their 2 dogs, AND SIL BIL their 2 kids and 2 dogs too!) It's going to be CHAOS!