Yup. She’ll be a great mom, teaching her children ethics as she practices them.
For simplicity’s sake, give the father the options of custody or child support - his choice. Give the mother no options at all.
This astonishes some Freepers, but someone may (legitimately) grow alienated from their (sucky) spouse, fall in love with someone else, indulge in intimacy with them, break up the marriage, and go on and live a very happy, productive, and good life with the other person. Happens all the time.
I agree that ideally they should leave their spouse before romancing someone else, but I know that reality is seldom ideal.