Susan was 25 when she married Felix, not "barely out of her teens." Furthermore, generally speaking, a 15 year old that needs psychological counselling, is a red flag for me. But, hearing her mother and reading about her testimony, I have to say that the apple didn't fall far from the tree.
But yes, a therapist who "sees" his patents, is problematical. But he is the ultimate here and not the perp, up for trial for his murder of his wife.
I also do not believe that Susan was isolated. Nice "fit," but it doesn't match the facts. She had her hands full (raising 3 boys) and constantly meddling in her children's lives, according to testimony. One of the sons mentioned that she had issues in each and every encounter she had that was not in her control.
She planned this murder, came back from Montana following her lawyer's call, came prepared (knife) when she entered the pool house where her poor, 70 year old, and extrememly tired husband (driving from Los Angeles) was resting, if not alseep. Those are the facts, together, of course, with 27 stab wounds onto his body.
I agree wholeheartedly with Adam's testimony re his mother. He loves her but thinks that she has to be locked up in a secure environment for the rest of her life. Who knows, if acquitted, she won't manufacture another scenario with her sons winding up dead.