u/Gloomy-Character9478

Hello, I'm just discovering the lore, but I thought I read that it's rare for several children of the same couple to be Aasimar, that often there's only one. So I was wondering if...There could be a sibling or half-sibling for an aasimar who was not human but had a "dark" side, which would give the aasimar a duality between their brother or sister and the light. If I may say so... I don't know if that's clear... Thank you very much anyway.