This is more for the kids,
I was 8yo when my parents took us on a 6 month world trip which started with 12 weeks in an RV (american campervan) driving around the states. To keep us occupied we had heaps of colouring/activity books, books, toys etc... and dad played games with us like having a list of things we had to spot and the first one to cross them all off one something at the next stop. This was all before electronic toys, portable dvd players etc (1995) and we were fine with it (for the most part! 12 weeks is pretty long to an 8yo!!!)

Have the best time! It sounds amazing!