Pat Houston, the sister in-law of deceased singer Whitney Houston, says she fears for her life after Bobbi Kristina‘s brother/husband Nick Gordon threatened her online.

[READ: Nick Gordon sends Ominous Message to Houston Family… ]

After Gordon posted photos of semi-automatic weapons online, Pat Houston headed to the courthouse to secure a restraining order against her niece’s new husband!

Details below…

Pat Houston and her husband Gary pose above with Bobbi Kristina and Nick Gordon during happier times.

According to TMZ,

If Whitney Houston were alive to see this … she’d be rollin’ — her sister-in-law just got a restraining order against the man who was like a son to her.

Nick Gordon — who grew up in Whitney’s house and married Whitney’s daughter — has been ordered to stay 200 yards away from Pat Houston — Whitney’s sister-in-law and executor of her estate.

Pat got the order after claiming she feared for her safety after Nick made threatening comments and posted photos of guns.

For his part, Gordon tells TMZ he was served with the order on Monday, but he “doesn’t give a f***.”

Definitely not the greatest love of all.

In the meantime, Bobbi Kristina is looking way too thin, but she says is all because she has her mom’s genes…

[READ: Bobbi Kristina on Weight Loss: ‘I’m My Mother’s Daughter’…]

What do you think of this ongoing Houston family feud?