Applejack's dark backstory

While some of you may already know of this, I know others who don't, so I'm going to go over why Appjack actually has a dark backstory. Well if you saw throught the series we've seen prity much all of Appljack's family members. Her sister, brother, granny, and numerous others, but who's the two family members of the Apples we've never seen? Her parents. Before I continue I know someone is going to say "well we haven't seen Fluttershy's or Rainbow's parents either" and yes you are right, but I'm going to explain why i think Applejack is the one with the dark story for it. Don't get me wrong, I could theorize a dark background for both Rainbow and Flutters to, but Appljack's is more confirmed than the other two. Well instead of me writing out everything, look up a video on YouTube called "Applejack's tragedy became part of her greatest strengths" (sorry no link but I'm on my IPad) by a Youtubers named DRWolf001 (this youtubers is not me). Well I must say, after learning of this I would say I could relate to Applejack the most now. I won't go into to many details but because of a similar problem I to can be stubborn and wanting to do all the work myself, especially at school as I try to do all my work alone as often as I can.