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."
Gary felt Gordon had insulted the family one too many times ... as soon as the party was over, he delivered the beat down. We're told it was a lopsided fight -- Nick didn't even get in a single punch.
The two are now sluggin' it out on Twitter. Gordon posted, "F*** all of em they've tried to fight me (Gary H) jealous ass n***a."
In response, Gary tweeted, "He still kind a sore from that last trip I sent him on smh .... I tried to tell him to buckle up lol."
Family Party Turns Into Raging Warfare
3/5/2014 12:40 AM PST BY TMZ STAFF
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