It wouldn't be that weird, and in a deleted scene from 2x22. Alice&Betty finds Falice's Son buried ashes, and Alice tells Betty if only she'd have stayed with FP, their Son would be alive, and she wouldn't been married to a murderer. Now I know the scene isn't canon, but Betty didn't look disgusted about Falice's Son being her&Jughead's secret Brother, like she was when she found out being related to the Blossoms.