Talk:Brotherhooves Social/@comment-2012421-20151013015534/@comment-11491781-20151117194155

Simple, in the original episode they were only there as placeholder-ish characters (a la TS2 townies, or any show with human BG characters that don't always appear with the same people) and there as many placeholders aren't needed.

If you really need a story reason, maybe Dinky does'nt have any siblings (she was found by Derpy and adopted as a baby? Her dad died and\or ran away?) and Amethyst is one of Whooves' old companions that wanted to race with Dinky.