My Little Pony: Friendship is Magic - Daughter? Mother?

Well, similar colors doesn't necessarily denote relation.

Just look at Pinkie, who looks nothing like her family. Or, dare I say, Shining Armor, who looks more fitting to be either Vinyl's brother or a genderbent version of her. (Which, I'm almost certain was his original purpose before they decided to tack on the "twilight's brother" thing.)

Of course, it would be kinda neat to see the animators roll with that idea. Just having her appear next to Derpy in the background would make people go craaaaazy.