Normally, the best way is if the legitimate parent files. Since the children are in Mexico, that won't happen. Go to IRS.GOV and download form. show more Normally, the best way is if the legitimate parent files. Since the children are in Mexico, that won't happen.
Go to IRS.GOV and download form 3949A.
Emphasize that the children live in Mexico.
Emphasize that the children are NOT legally or biologically related to your fiance.
Supply as much information as possible, his name, address and the childrens names. SSNs would be better.
You can add that his tax returns are professionally prepared.
If he's related to the children (say he's the Uncle), the MOST he could claim would have been as a qualifying relative, This would not have made him eligble for the
$1000 child tax credit, EIC or HOH. Even then, he'd have to be able to prove they were the children of his brother or sister and that he provided more than half of their total support.
The only good news in this arena is after slacking off for a few years, the IRS is back with a vengeance on verifying claims to nieces and nephews. Once caught on a current year return to a claim of a bogus relative, he will be audited for all prior years.
BTW, if you call the IRS, all they phone assistors will do is mail you the form. They will not fill it out for you.
To report the preparer, if you think they are a CPA, EA or attorney, you can write the office of professional responsibility.