The child living with you has a support claim against the mother, too. However, as support claims are entitlements of the kids I do not think that both support claims can be offset against each other.
The statute of limitation for child support claims is four years. Moreover, irrespective of the positive results of the paternity test your father-in-law is not deemed legally a parent of the child legally
Please be aware that the residence permit of your Turkish boyfriend might have ended already at the time when he and his wife separated. There is no need for a revoke. The permit would have exceeded automatically
Dear Rob, I am not an Immigration lawyer. Let her Employer or a friend with a company write a letter that they only want to hire her as a US citizen and you need to come up with a reason why. I am sorry
Dear Robert, the German court can divide American retirement benefits (as long as it is not Army retirement). They need to hire an expert and it takes time. I don't know about the US courts because I

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