Both the grandpas sided with Euiyoung

One of the guys who is the closest I'll ever have to a brother has always had great girlfriends (one I'm not sure how long they dated so I don't know if she counted; I saw her once and it was like proof, gone.) The girlfriends always said the same thing after they broke up:
"I'm keeping your parents."
So despite having only boys, they have a lot of bonus daughters. It's made sense to me so that strip, minus the "does that make us brothers" part, was on point.