it really depends on your baby. if she hates the carseat, it's not a good sign. we're taking a 12 or so hour trip to NC this august with DD (similar rental situation with my parents). dd is VERY used to the carseat- she commutes 2-3 days a week 50 miles each way with dh to work (creative daycare
) and we just drove to MA from NY this weekend for one night.
there are a few ways to handle it. do you have to drive down with IL's? 2 hours or so at a stretch is really all a toddler should be able to handle without a break. for NC we are planning on leaving at an ungodly hour (like 4 am) to maximize sleeping for her without driving all night for us. we borrowed a portable dvd player & brought some sure-fire favorites (signing time, sesame street). we stopped after 2.5 hours & let her run around, eat, change, etc. she only napped 1/2 hour or so- she's not a big car sleeper! we had a bag full of activities that she loves (favorite dolls, books, toys, including really noisy obnoxious ones - cringe!). & rotated them when she lost attention. we used 1 dvd there & 2 back but we took 6 hrs to come back with extra stops (toys r us was a great place to run around!).
it can be really tough & not all kids are good in the car. really weigh the pros & cons specific to you & dd! I'm so sorry for your loss & absolutely sympathize with the need to get away! I hope you can find a workable solution!

there are a few ways to handle it. do you have to drive down with IL's? 2 hours or so at a stretch is really all a toddler should be able to handle without a break. for NC we are planning on leaving at an ungodly hour (like 4 am) to maximize sleeping for her without driving all night for us. we borrowed a portable dvd player & brought some sure-fire favorites (signing time, sesame street). we stopped after 2.5 hours & let her run around, eat, change, etc. she only napped 1/2 hour or so- she's not a big car sleeper! we had a bag full of activities that she loves (favorite dolls, books, toys, including really noisy obnoxious ones - cringe!). & rotated them when she lost attention. we used 1 dvd there & 2 back but we took 6 hrs to come back with extra stops (toys r us was a great place to run around!).
it can be really tough & not all kids are good in the car. really weigh the pros & cons specific to you & dd! I'm so sorry for your loss & absolutely sympathize with the need to get away! I hope you can find a workable solution!