Sunset: so what did you want to talk about?

Celestia: well this is awkward considering who we are dating but *deep breath* Sunset I am your mother!

Sunset: no that's not possible! I was told my parents were dead by the orphanage!

Celestia: search your feelings you know it to be true, I mean come on you have our family cutie mark.

Sunset: family cutie Mark?

Celestia: oh wait you ran away before we covered that topic, a family cutie Mark is a rare type that follows a family line blessed by harmony for example the Sparkle family Luminar Nova the purple star burst regardless of what talent you have and what cutie mark you gain the family mark will always be part of it for example ours is the stylised sun, sun salutation. Luna inherited mother's family mark umbra which frames the cutie mark she got the moon. Its hilarious when ponies mistake her for a pinto.