Cuck, with a capital ‘C’.
Asking a serious question: Do you think he knew about his wife's activities? How could he not? Did he simply ignore it? Or even support it? Especially a mom with 3 kids, how did she hide it from her family?
Big time.
Pack her things, kick her to the curb, and file for divorce. Sue for full custody.
She is unfit to be around children.