It's nice to see the show use alot of real life family issues. Like Scootaloo being a orphan, or Applebloom being parentless. Actually come to think of it, I think all of the cmc have some form of Family issues.
Though, my apologies for this pic giving off that impression! Given the title I gave this image, I thought that might raise some eyebrows and give folks the wrong idea. But, like Barbaro mentioned, since Big Mac is the oldest of the three siblings, let alone the one brother, I thought he'd be the next closest thing to a father for Applebloom.
How is it disturbing? Big Mac is the oldest of the 3 so with Applebloom being so young he probably had to grow up really fast to help take care of her most likely the same with Applejack though who knows how old she was when their parents passed. My dad passed away when I was younger but my brother and I still get a gift for our grandpa every father's day so wouldn't be weird to see someone as little as Applebloom get a gift for her big brother.