Kathy Hilton is the mom of Paris Hilton. She’s also the sister of Real Housewives of Beverly Hills star Kim Richards, and her pride in her sister was the topic of choice as she chatted recently with People magazine.

It was at the Ovarian Cancer Research Fund’s 2nd Annual Super Saturday event, sponsored by FIJI Water, in Los Angeles, that Kathy Hilton was asked how Kim Richards in faring in rehab.

“I’m very proud of her,” Hilton said. “She decided on her own to go.”

Kim Richards entered rehab last month following a very painful intervention with Dr. Phil McGraw. That meeting followed her arrest for public intoxication, trespassing, resisting an officer, and battery on a police officer in Beverly Hills on April 16th.

A source close to the RHOBH star People says Kim Richards will attend her daughter’s wedding next weekend.

“Kim is so excited for her daughter’s wedding next weekend. She wouldn’t miss it.”

Kathy Hilton says sister Kim Richards is "doing really, really well" in rehab http://t.co/CrnHnIKNQc

— People magazine (@people) May 17, 2015

Kathy Hilton replied via Twitter when a fan asked if Kim was already out of rehab. The question was raised because Kim Richards attended her daughter’s bridal shower.

@plainviewsue Yes she is still in rehab, they let her come for a couple hours with a sober companion 2 enjoy her daughters special day.

— Kathy Hilton (@KathyHilton) May 15, 2015

Kathy Hilton says she doesn’t know if Kim Richards will return to RHOBH next season, but she believes the show has been good for her sister.

“I think the show has been really great,” she said. “I mean she’s a professional. She’s an actress. But this is real.”

“Kim needs to learn the tools to cope when there is something that’s upsetting,” Kathy Hilton added. “You have to learn to use the tools to not fall off the wagon.”

Real Housewives of Beverly Hills costar Brandi Glanville has been to Kim Richards’s rehab facility to visit. It sounds like she’s holed up in quite an impressive facility.

“I would die,” Glanville said of how she would likely react to having to go to rehab. “But if you saw where her rehab was. I was like, ‘Anyone could use 30 days here. It’s really nice!’ I don’t want to out where she is. It’s beautiful. I took the kids, and was like, ‘This is the Four Seasons or something.’”

Some people who follow the Real Housewives of Beverly Hills–but not religiously–might not even have known that Kathy Hilton and Kim Richards are sisters. You’ll notice Kathy Hilton didn’t mention sister Kyle Richards at all. She hasn’t been particularly supportive of Kim’s problems with alcohol.

Fortunately for Kim Richards, she has sister Kathy Hilton in her corner. Everyone fighting addiction of any kinds needs to know their family is behind them–and their friends, too.

Will Kathy Hilton, Kim Richards, Kyle Richards, and more have a big family reunion when Kim’s daughter ties the knot next weekend?

Now that might be good fodder for the Real Housewives of Beverly Hills.