Hm, I've thought about something, it was too much of a mind-juggler to figure out just in my head, so I drew up a family tree-thingy in Paint, and I've realised - if Drawshine is the nephew of Mautope, that means he's the son of a pony who is Mautope's sister or brother, but Sweetchy is obviously far too young to have children. So Mautope needs another sister or a brother so this is possible.