You can get what’s called an IP PIN number to attach to each social security number. The PIN number is required in order to efile a return.
go to irs.gov and search IP PIN (identity protection PIN) to get started.
While it won’t help this year, do it as soon as you can to prevent him from filing again next year.
I’m sorry you’re having this issue I’ve been there and know how infuriating it can be.
