In Michigan what is considered extreme parental disinterest?

A prime example would be Marcia Clark, the OJ Simpson Prosecutor in 1993. Gordon Clark was a stay at home father, working from there as an architect earning $40,000 a year. Ms. Clark felt this was demeaning to her and the children, as he did not have an advanced degree and worked for a corporation earning similar to what she did. She worked 100+ hours a week, earning $180,000 a year.

When she filed for divorce, she got custody of the kids. Since she had no time for them, she hired nannies to raise them.