Now, I would have put Jim and Veronica as a couple. Veronica raised Marten to be a nice guy, but she's also there to guide Sam through the process of becoming a young woman. So she's done double duty here.
But in the end, I voted for Mrs Augustus. She raised two kids, on her own for some time now, guiding one of them through a very difficult in their life. Dealing with another's life changing injury. Winding up as a bass playing, pot smoking,, sexually free woman of a certain age.
Veronica was fortunate enough to do what she does on her own terms, and apparently get to a place her life in a position of some comfort.
Faye's mom seems to be doing pretty good, in spite of what has occurred. Maybe handling the event, overall, better than her elder daughter.
Sorry, just rambling.