Figure with a group centered around the Royal Pony Sisters' parents I should ask the following question: Who are they? Who are their parents, are they still alive, are they still around?

3661208 No one knows
The most popular theory is Faust is (Fausticorn) In relation to Lauren Faust as she created the show and all the characters including Celestia and Luna

Other stories say of other Alicorns with various names e.g. Galaxia (mother) and Cosmos (father)

3661208 ill put mine in later

3661208
Derpy and Soarin.
(There was a little mix-up with Time Turner, and the two spent some time in the past.)