How many cars seats do you have for each child?
My son is 3. He has 3. One in grandmas car (which I never did understand why she bought one and I refused to buy her one because she only takes him about once a month. One in dh car (which hardly gets used) but he is about ooutgrow it in height since it is like half a inch away and we are debating buying a new one for that car. And one in my car that he uses dairymendairymen