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Bobbi Kristina

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Whitney Houston’s son-in-law got his ass beaten by one of Whitney’s nephews at a formal family gathering … and it’s all because of a long-simmering family feud … TMZ has learned.

We’re told Whitney’s nephew, Gary Michael Houston, went nuclear on Bobbi Kristina’s husband, Nick Gordon … allegedly SLAMMING him to the floor and pummeling his face — accusing him of talking crap about the family.

Family sources tell us … it all went down at a Sweet 16 party for Whitney’s niece, Rayah. We’re told it was a formal affair — everyone in tuxes and long gowns — but Nick showed up in a hoodie and knit cap and “lookin’ like a thug.”ounce

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