Marcy.....Oh how I adore kids. It's been many many years since my own darlings were little and traveled with Mom. Of course, since my "grandchildren"...all 13 of them, are flawless, perfect Angels who can do no wrong~~ever, I need to go way back & try to remember my solution to keeping my own boys occupied on long car trips.
As I recall Marcy, I used a good strong duct tape and some clothes line. Worked well. Except a few times I forgot to bring the tape and clothes line along, so I used Plan B, which was driving them out to the beautiful countryside with miles and miles of grape vineyards, fresh air & the beauty of nature.....letting them out of the car and encouraging them to go on a healthy 50 mile trek of adventure & experimentation in the great outdoors.
After the first couple of times, it took them only 2 days to get back home.
I was always creative like that.