I think it makes Mihla Emma’s Aunt, not great grandmother, or is it?
If Bae is Neal then Milah and Rumple have no relation to Emma at all. If Neal and Emma had married, Milah and Rump would just be Emma’s in-laws. Not aunt, not grandmother, no. Father and mother in law. If they had married. But they didn’t.
If Neal is Bae, then Rump and Milah are just the parents of the guy Emma slept with.