Thanks for all the responses.
To clarify, if my (Citizen) wife files, then it doesn't matter if they get married or not. And if they do at some point, the spouses can be added to the petition?
If her mother (resident) files, then they can't get married or the petition is cancelled. But if mother becomes a citizen (even after filing as a resident), then they can get married? The petition just gets updated with her mother's citizenship proof?
Is that correct?
And if they get married during the process, is marriage evidence submitted to update/change the petition category?
Also, if wife, and then later, mother file, is there any issue with 2 petitions running together? Or they just stay running together and whichever happens first, happens first?
Thank you!