i have an idea for a puzzle..some people have mentioned being able to put a kid with another mother when they are two.Maybe there could be a building that noone knows what to do with(like the school)then you need a master parent to make it a daycare,then they will always babysit kids when they turn 2 until they are around 6..and before you have this building the mother would need to stay with them until they are 6.when the master parent dies,any kind of parent can take over the place(must be atleast traineee parent)