Yep. Jade's got nothing to do with it by involvement, but I believe it's due to her previous actions and lack of sensitivity to Stephen and his problems that led him to that point. I'm not excusing what he did, he chose that path instead of divorce all those years ago. But it's due to Jade and how narcissistic, egotistical, proud, arrogant and controlling she is that it led to that point. It's pretty clear that Stephen had tried to please Jade in the past but it never worked out. And Sage even said so herself: she couldn't even talk to her mother about her issues, and her father would just shut down if she tried.
I think for a lot of the problems in the family...Jade is the primary cause. She was the one that primarily raised both Sage and Tybalt after all. Tybalt turned out the way he is due to Jade spoiling him, she even has a 'mother complex' where she enjoys being called 'Mommy' by MC during sex. On it's own it's not a big deal, but if you put all the pieces together it paints a very ugly picture.
Thoughts?