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Are your parents still married? Yes, you would file your own I-751. The key here is that you would still need to show that the qualifying marriage is/was bona fide, that is, your parents’ marriage. Whether they live in the US or not isn’t really relevant to your I-751 since you are filing separately, as long as you can provide evidence that they still have a valid marriage. Your marriage also isn‘t relevant to the conditional residency, so don’t worry about providing evidence for that in this I-751 beyond just your marriage cert to establish marital status.