So here is my situation. My husband and I rented a 12 passenger van for a family reunion and plan to leave in am. We are taking our 5 kids mil and 2 cousins at least that was the plan. Our uncle droped off his daughter and grand daughter. When they pulled up the 3 yr old was in no car seat or seat belt. I asked where her car seat was.(she weighs no more than 25 pounds and was a super premie) I was told they dont think she needs.a car seat so I offered one our daughter doesnt fit in. I will not drive 6 hours with her not in a car seat. This started a big conflict with the uncle and cousin(her mom). Is there a law in illinois specifically requiring her to be in a seat based on age and size. I dont want to start a family war but I am not willing to be open to legal consequences or have our family be unsafe in an accident. What would you do and do I have option to require carseat or refuse to take them with.