And because their ailing mom, Miriam, was already behind on two quarterly tax bills when she succumbed to illness on Aug. 13, the charges went unpaid for more than a year — growing to $4,146.

It wasn’t until The Post confronted Holder last week about the delinquency that he and younger brother William Holder finally paid up Friday, including $73.14 in interest.

The siblings “weren’t aware of the initial missed payments, which happened in the last months of their mother’s life when she was battling illness,” said a Holder spokesman.