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Description
The Piedra sisters.Born and raised in a small mining town in New Mexico. Calida and María Molina have stayed behind to support their parents while Rosita and Madelina have gone off to pursue their dreams. Madelina recently obtained her Ph.D. in geology from Las Cruces College. Rosita works as a baking apprentice and entertainer in Ponyville, Nebraska. Madelina is the eldest, Calida the middle child, and Rosita and María Molina (non-identical) twins.
Probably better than making them Mormon or something. Since that would also fit with the theme of insular religious community in Mexico.
Because “Piedra” means stone
why not De La Roca?
(Though this is only stated in the “My Little Pony: The Elements of Harmony Vol. II” guide book &, of course, has no bearing on this AU.)