SS comes across to me as such a screaming weirdo deadbeat. Her mother JS is bipolar. MS was evaluated for multiple issues herself. Did the professionals evaluating MS look at her home life and think it was just fine or ?
SS is definitely not someone I would be thrilled about to have as a "father figure" to any young kid I care about, even before we know about the SA or the other disgusting stuff his friends revealed. No stable job, no assets, the weird childish toy obsessions, the drug use, moving back and forth to mommy & daddy and then having his own room so he can be "close" to MS even when not in a relationship with JS? Alarm bells, loud and clear especially where JS has bipolar that she herself says "kicks her butt."
People have very low standards for what is normal and acceptable.