>>2667393Lain wasn't alive very long. She was just kind of brought into existence with fake memories and a preset fake life until she fulfilled her purpose. Notice they all left the house when they knew lain wasn't home/awake. It was basically a day job to them. They were a legitimate family but Lain was only with them for a little bit. Also none of them cared about her other than whenever her dad bought her the computer so she could fulfill her purpose.