Thanks for the reply. As I said, it would have been nice to have her file even though she doesn't need to, just to have it if requested at some future point. She'll have more USCIS dealings for his immigration and her Naturalization for example. But that form W-7 is no simple or quick task. There's a bunch of stuff son-in-law would have to produce (and probably be lost in the process. So I think we will just pass on her even filing this year.
One of the immediate things I was hoping to file for is to have one of the two documents to show residency for her State ID (Real ID compliant) card. But we'll need to go another route for that.
