Rest easy, Warriors fans.

Klay Thompson’s dad assured me Friday night that NBA finances and salary caps be damned, Klay isn’t going anywhere.

Klay Thompson has one more year on his Warriors contract, then he can become a free agent, unless the Warriors sign him to a long-term deal. That’s no slam-dunk, given the complexities of NBA contracts and the Warriors’ massive payroll.

Owner Joe Lacob has forklift drivers moving around bales of cash to try to keep his roster intact.

“Oh yeah, you can mark it down,” Mychal Thompson said at a party to promote the Thompson Family Foundation’s first charity golf tourney. “Klay’s going to retire in the Warriors’ uniform. He’s going to play at Chase Center (the Warriors’ San Francisco arena, opening in 2019), and he’s not going to be at Chase Center as a visiting player, he’s going to be a Warrior for the next seven or eight years.”

I didn’t get a chance to ask Klay himself about his future with the Warriors. He was busy hosting his party, walking the red carpet (yes, they rolled out a short red carpet in the lobby of the hotel just off the Embarcadero) with his faithful companion Rocco.

Turns out those red-carpet conversations don’t go too deep. Gotta keep it peppy and superficial.

For instance, Thompson talked about his tan.

“I’m a beach boy,” said Klay, who grew up near the beach in Los Angeles and lives near the beach in the Bay Area, “so I’ve been at the beach, played a lot of beach volleyball. Played a lot of soccer. I love to cross-train, but I’ve been getting in the gym, too. See this tan on me? I’ve been outside, it’s nice, (get that tan locked in) before I get all pale.”

A pasty Klay is an unhappy Klay. He needs his vitamin D.

Of course, Thompson talked about his new teammate, DeMarcus Cousins, whose signing with the Warriors has a lot of people crying about the Warriors’ talent overload.

The Warriors don’t care about that. They’ve got Cousins and you don’t. Thompson and Cousins bonded as teammates on the U.S. Olympic team.

“He always made fun of me on Team USA for the way I dressed, the way I looked, the way I talked,” Thompson said. “DeMarcus is a great teammate. I’m excited to be his teammate, man, I can’t wait. He’ll add a whole new dimension to our team, and I know how hungry he’s going to come back. Cuz is great, he’s awesome.”

Cousins wasn’t at the party, but JaVale McGee, the former Warriors center who signed with the Lakers, dropped by. McGee checked into the hotel wearing a hoodie and Lakers game shorts.

As much as Warriors’ fans loved McGee and his eccentricity and his bursts of inspiring energy, they’ll stop missing him the first time Cousins goes for 30-20-10.

But back to Klay’s dad. Klay will be going into his eighth NBA season, and there is Warriors fan anxiety about his future. Some men will take less money to play with a team for which they want to play, but it could come down to Klay taking a massive haircut to stay with the Warriors.

“He’s got such a good thing here,” Mychal Thompson said. “The Warriors have such a special thing here. For the next six or seven years, they’re going to be championship material, they’re not going to break that up. The Bulls (with Michael Jordan) were broken up too prematurely. Joe Lacob and Peter Guber aren’t going to let that happen. Are you kidding? They can afford it. They’re the Warriors, this is the Bay Area, they got a beautiful arena, and money’s no object for this team.”

One thing is certain: Klay will be with the Warrior this season.

“I think you’ll see a hungrier player,” Mychal Thompson said. “He’s going to try to get more versatile, try to get to the basket a little more, more free throws, being more efficient on offense that way. I always tell him, try to make it a goal to shoot eight (free throws) a game. Eight or 10, like James Harden does.”

To get to that level, Klay will have to take flopping lessons.

“He’s just coming into his prime,” Mychal Thompson said. “Twenty-eight (Klay’s current age) to 34 are your best years of basketball.”

Fortunately, they will be spent in the Bay Area. Mychal Thompson guarantees it.

Scott Ostler is a San Francisco Chronicle columnist. Email: sostler@sfchronicle.com Twitter: @scottostler