I am not sure if there was a thread before about it or not, I will post it just in case anyway. I think I found official Rainbow Dash's dad xD While I was watching AGAIN a great episode, I noticed something I didn't before. In the scene where Rainbow Dash is having a flash back at the start of the episode she sits on a stallion and for a close up she stands next to him in the next scene. What are the odds that two ponies have manes like that and are not related xD
His name is Rainbow Blaze, and while he's never been officially confirmed as RD's father, it's fairly common fanon.
It was mentioned on Equestria Daily that S6 might possible involve characters... Spoiler That will reveal information involving Main 6 family members. He may or may not be brought up legitimately this season. We'll see.
Oh my gosh! I would love that~ so would many fans. We don't get to see the family life of most characters, save for Twilight and Shining Armour/Cadence. It would be very good if Hasbro used this opportunity~
Here's proof just in case there are those who think I'm just making it up: http://www.equestriadaily.com/2016/03/official-season-6-opener-press-release.html#more