Poe, Finn, and Rey add a kid to their family. Maybe they rescue one from the First Order, or take one in from a decimated planet, or adopt one whose parents have been killed. Whatever the reason, they suddenly bring a kid into their lives and it works better than anyone expected because Poe has experience growing up with a family while Finn and Rey know what it's like to not have a family and wouldn't wish that experience on anyone else.