Women "want" abusive husbands, that doesn't make it a wise choice.
Usually when we "want" something that is clearly bad for us, there's a reason. Often rooted in childhood or family-of-origin issues.
So - what do you think there is in YOUR history, that makes you "want" someone capable of lying to you for months, cheating on you, yanking her children from one man's home to another without thought for their well-being (couldn't she have gotten her own place, or returned home to family, rather than put her kids through getting attached to another man prematurely?)
This is a REALLY important question for you to answer - far more important than any strategizing on what might or might not bring her home.
Sure, she might come back if she realizes the grass isn't greener with OM and his parents. But trust me, you don't WANT her back if it's just because she needs a place to live and you are the lesser of two evils.
Sooooo....think hard......why do you suppose it is, that you would be willing to take a dishonest person back into your life?