I find it somewhat revealing that Globyn never include their families in anything, unless its grandpa Glenn visiting with Atlas. It makes me wonder if the families have turned their backs on them seeing all of Robyn's antics. I bet Glenn's mother and sister cannot stand Robyn for what she's done to Luna and of course, to their son and brother.
Robyn's family seems dysfunctional, although I have no proof of this. She's always talking about having to heal from trauma and anxiety, so I'm thinking as bat-shit crazy as she is, it probably goes back all the way to her childhood.