Re: 12 hour car trip....advice
Audiobooks and music are big things for us. The kids always get a new book (at least one), and they bring a few toys. Sometimes we do electronic devices, and sometimes we don't. We play travel games. For food, we pack granola bars, fruit snacks, and some sort of fruit (this is usually eaten at whatever restaurant we stop at).
Make sure everyone gets out and walks around a bit when you stop, and make everyone go to the bathroom at each stop (within reason).
Oh, and ColorWonder is great for driving. Long trips are the only time we buy them, though we've not bought them the last couple trips we've made, but then, our kids are getting older (youngest is 5 now), so regular crayons or markers aren't as big of a deal in the car.