While there is much epicness and lulz being done in this thread, I have to say I REALLY feel sorry for those kids. Most people who cheat, and cheat with vigor like Grobster, will do so again. Which means, given a few more years or less, he will leave his current wife and child in his wake.
The kids are going to be the one who suffers the most, worst part is, he is such a good liar, I think he has convinced himself that he is a good parent/partner. Honestly, I can only hope and pray he grows up, or he gets nuetered in his sleep or something similar.