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Mark Madoff wasn't at his father's sentencing yesterday, although no one really expected him to be there considering he says he hasn't spoken to his dad since his arrest in December. So where is he? In Nantucket, apparently, where he's doing his best to redeem the family name, according to a Deabreaker tipster:

Apparently Mark Madoff cut our tipster's girlfriend in line at local sandwich shop Something Natural, was rude to the staff, placed his order without putting down his Blackberry and claimed he was "in hurry." Mini Madoff whipped out "a big wad of cash" to pay for his food before running out the door and into a big SUV with blacked windows.

He did leave a tip, though, if that's any consolation. [Dealbreaker]