My personal headcanon is that Mr. Kiryuu gets jailed, either for child rape or for some money-related bullshit. Either way when his cellmates find out he raped his adoptive son they murder the shit out of him.

I can see it. If her husband's more interested in raping little boys he can't be interested in her. But if her little screen time is any indication of her character she's probably fine with it as long as she can reap the benefits of being married to the bastard.