You notice how so many couples look very much alike? imo those marriages last the longest more often. Something like that.
Its funny how so many wives look like their husbands sister.
You want a great example? George Clooney dated smoking Nordic blonds. Nancy somebody. Who did he marry with the world of woman to choose from? A woman who looks like a female version of him. Same distinctive eyes...a strong resemblance. Its natural. I'm not the first one to notice the effect.
It would explain Kate and Paulie. They could make kids and everybody is obviously from the same tribe.