He tricked her into marrying him
What he's doing is wrong... and I doubt very much he's going to file for his son. Should she inform immigration? That's her choice and she really needs to think long and hard about that, but I agree with her, he's being deceitful in order to go a farin. God forbid if the wife finds out that he used her to get to the US. Mek him gwaan yah lady, karma will come and you're better than that.
True life story: 'I caught my wife in bed with another woman'
You need to drink some tamarind bush!
If it was me, I would join in instead of getting high blood pressure.
A very able lot
The secret is to develop a strong mental concept and believe the impossible is possible, plus see life as a game and aim to win at all costs.