Things just ain’t been the same since Bobbi Kristina and her brother/boo Nick Gordon said ‘I do’ a few months back.

[FLASHBACK: It’s Official! Bobbi Kristinas Brother/Boo is Now Her HUSBAND Too… (PHOTOS)]

The couple also hit the airwaves to speak about their controversial union, and Nick even admitted that he once viewed Whitney Houston as his ‘Mom’ and her daughter, Bobbi Kris, as his sister.

[WATCH: Newlyweds Bobbi Kristina & Nick Gordon’s 1st Post-Marital Interview.. (VIDEO)]

Now that that’s all been determined, a few of Houston’s family members isn’t on board with Whitney’s only heir being married to her ‘brother’ and Nick called them out online.

The ‘Gary H.’ that Nick is referring to is Gary Houston (Whitney’s nephew) and apparently Gary, who isn’t too fond of Bobbi Kristina’s brother/hubby, tried to beat him up recently during a family function!

Details below…

Gary Houston got wind of Nick’s tweets and responded in kind…

According to TMZ:

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 … 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.”

Gary has since apologized for the online drama, stating:

What do you think about this brewing ‘family feud’ between Bobbi Kristina’s Brother/Hubby & her cousin?