The whole Apple Family
Applejack's whole family, the "Apple Family", has appeared so far in only the episode of Friendship is Magic, part 1 when Applejack invites Twilight and Spike to brunch.
Applejack later explains they had all gathered for the apple family reunion. In Applebuck Season, it's revealed that members of the apple family live all over Equestria and run their own apple orchards.