Lets say mother and children are claimed on his taxes as dependants because taxes were done themselves instead on through a tax service provider to prevent it from being done.
Now their father is about to file taxes but doesn't plan on claiming them because he doesn't know if their mother had her boyfriend claim them or if she did. It isn't his year to claim them, but he could if mother filed them illegally under her boyfriend. How would he find out who claimed them so he can know if he can claim them?
