Actually, we know nothing about RD's family either. I mean, Scootaloo is kind of her "little sister", but otherwise, we don't know who the heck her parents are! :okiedokielokie:
This never happened in the series, and I can barely understand what you wrote because it had such horrible grammar. (Sorry, I just had to say it. It kept irritating me.) But on the other hand, Fluttershy's family has never been introduced to us in any of the seasons.
I was thinking of making a fanfiction on Fanfiction.net, but I have no character ideas. So, if you could post some ideas below, that would be great. Thanks.
-Lunar Moon
It seems Rainbow Rocks has to do with music. Because in all the trailers, they are on stage singing songs. But that may not be the whole point of the movie, I have no clue.