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Also, if we are divorced and he is approved, am I still responsible for him if he gets on welfare? I know that when I signed the form to sponsor him it is legally binding for ten years even if there is divorce but does that apply if the divorce happens in the first two years?
There are five conditions that terminate the I-864. Divorce isn't one of them, even if it happens in the first two years. The passage of ten years isn't one of them, either. The five terminating conditions are:
His death
Your death
His becoming a citizen
His being credited with 40 quarters of work for social security purposes
His leaving the US permanently
Also, while the affidavit certainly talks about reimbursing the government for means tested benefits, I'm not aware of any actual case where it's been enforced for this. Recent immigrants usually aren't eligible for most means-tested benefits. I AM aware of a few cases where the affidavit has been enforced directly by the alien spouse against the USC spouse. When you signed the affidavit of support, you promised to support him at 125% of the poverty guidelines until one of the five terminating conditions happens. If his income falls below that, he could sue you to make up the difference. I'm not saying that's likely, but it's something to be aware of. Google "Stump v Stump". And make sure your divorce lawyer is aware of this situation.