How to persuade my mother to stop her infidelity?

I am beginner in journey of way to truth, and life in general, through Buddhism. It's not long since I discovered Buddhism, and it really gives me insight in life. My question is that I'm having really hard time, and I'm in confusion about what to do, in that my family is tearing apart because my mother is cheating on father with another married man, and I don't know what to do about it.