I am trying to find a car seat that my two year old can travel in safely. The problem is three children,two three point seat belts and one lap belt. Which one gets to travel with only a lap belt? Does anyone know of a car seat with harness type straps which can be securred into the back seat with only a lap belt? The seat I'm using at present can be but he has almost outgrown it. I've checked the reviews of car seats and some can be used with lapbelts but that is all that is holding the child in. Do other people consider these safe enough? I've read reports of children ending up paralised in accidents because they were wearing only lap belts.