Really, you guys don't find her suspicious? She's constantly lying and withholding information from MC. Plus she's allied to Alaina, who's GIGA sus. There are two big sus scenes with Mom, first in the one you get if you don't kiss Ellin at the start, where Mom and Alaina discuss Ellis' exile and it sounds like they're the ones who orchestrated it, though later it is said Father ordered it. The second is after you meet the cousin twins and Mom and the girl have a fight; the girl calls Mom a pathological liar, and when Ellis questions her, she immediately shifts the focus and seduces him. The second scene wouldn't be so suspicious knowing Mom's sister is jealous of her, except that when Ellis' asks why they fought Mom lies and says she doesn't know. Later, the truth is revealed when we meet the aunt, but it's worth asking: did we find out only because the aunt was present? Why didn't Mom just say the truth from the start? Also, there's the whole matter of Cass' rebellion. We know Alaina helped her with it, and it just so happens Alaina also helped Mom escape. AND we know from the past vision that Father died instead of Cass' mother.
They seem to be elf supremacists, but at this point, it's hard to tell if that's all there is to it.