any version of us (would end up here)

Edward Elric is born with a healthy set of lungs and two bright soulmarks on his tiny wrist. The marks are bold against his skin, and when his father holds him up to get a closer look, Ed smacks him on the nose with an uncoordinated fist.
Trisha Elric laughs.
A year later, when Alphonse Elric is born with an identical set of marks, one above the other on his shoulder, Hohenheim’s curiosity sinks into confusion.
Trisha coos at her sons’ matching marks and smiles.

Or: a soulmate AU where soulbonds are familial rather than romantic, and Ed and Al will always have parents, no matter if Hohenheim walked out on them and Trisha isn't there anymore.

Inspired by "The Rights and Obligations of Fated Parents: Aizawa's Messy Journey to Parenthood" by Hayato (TheLennyBunny) & SugaSugar