If it’s not allowed, then how did she get the second exemption? Seems the problem is with whoever processed the exemption requests, not MTG and her husband. I’ve never owned a home, or any property. Am I missing something here?
Yes, you are missing the mandatory property tax payments.
I recently changed my primary residence and tax exemptions from Cobb to Gilmer county Georgia. Gilmer Co. would not make the homestead exemption active until they had a letter from Cobb verifying the cancellation of the exemption there. The homestead exemption is nothing but if she is over 62-65 the exemption from school tax in most counties is significant.