In February, on the eve of a matchup against the Trail Blazers, Warriors guard Stephen Curry attended a girls high school basketball game in suburban Portland, Ore., to watch his close family friend, Cameron Brink.

His gray hoodie pulled tight over his head, Curry tried to not cause a scene. Impossible. As teenagers flocked toward Curry, high school staffers formed a makeshift shield around him. Before the game ended, he darted out a back door, only for students to scream as his car sped away.

“It was crazy,” said Michelle Bain-Brink, mother of Cameron, a Southridge High forward. “It was like the Beatles were leaving.”

Cameron, who has known the Currys her entire life, finds Stephen’s fame funny. Although others see a two-time NBA MVP idolized by kids around the world, Cameron sees an older-brother figure who just happens to give her pointers on her game.

Two months ago, after weighing scholarship offers from some of the top college programs, Brink — a five-star recruit ranked the No. 2 junior in the nation by ESPN — committed to Stanford. If she was going to leave her family in Oregon, Brink at least wanted a support system nearby.

“Steph played a pretty big role in my decision, because it’s really important for me to have family around,” Brink said. “Not only does he live there with his wife, but his mom’s always there because of the kids. … I feel like it’s just going to make the transition so much easier for me.”

Added Curry: “For four years, she’ll be right down the road. We’ll be able to keep tabs on her.”

Bain-Brink has been best friends with Stephen’s mother, Sonya, since they lived in the freshman dorms at Virginia Tech. Both played sports, Sonya on the Hokies’ volleyball team and Michelle the basketball team. After a few months of living next door, Sonya convinced Michelle’s roommate to switch rooms with her.

Sonya left Virginia Tech after her junior year when her then-boyfriend, Dell Curry, was taken No. 15 overall by the Jazz in the 1986 NBA draft. Less than two years later, Bain-Brink was at the hospital when Sonya gave birth to her first child, Stephen.

When Michelle’s husband, Greg — also a former Hokies basketball player — returned to Virginia Tech to earn a graduate degree in the early 1990s, Sonya re-enrolled at the school to complete her bachelor’s degree. A 5-year-old Stephen lived for about a year with his mom and younger brother, Seth, in a house Sonya rented with Greg.

Michelle and Greg are the godparents of Stephen and his younger sister, Sydel. Sonya and Dell are the godparents of Cameron and her older brother, Cy. The two families have gone on trips together to Hawaii, the Bahamas and Disneyland. When Stephen was a teenager, he stayed with the Brinks in Beaverton, Ore., for a week each summer. Some of Cameron’s earliest memories are of playing in the Currys’ pool behind their Charlotte, N.C., house.

Saturday’s game Who: Warriors (23-13) at Blazers (20-15) Where: Portland When: 7 p.m. TV/Radio: NBCSBA/95.7

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“I still remember Sydel and I were splashing Steph with water, and he was pretending to melt like the Wicked Witch of the West,” Cameron said with a chuckle. “He was making shrieking noises like the fool he is.”

In those early years, Cameron was interested more in art than in sports. In sixth grade, when some of her friends signed up for a youth-league team, Cameron decided to play organized basketball. A year later, Stephen — by that point, the face of Golden State’s franchise — stopped by one of Cameron’s practices and overhauled her approach to foul shots.

In coming seasons, as Cameron started on Southridge’s varsity as a freshman and sprouted to 6-foot-4, Stephen followed her career closely. When Cameron was called for a technical foul during the Class 6A girls state championship game in March, Bain-Brink received a text message from Stephen, who was watching on Hudl.

“She picked up basketball at a little later age, and no one really knew that that was something that she loved to do,” Curry said. “Obviously, she’s a competitor. She’s feisty. She’s gotten extremely skilled in a short amount of time. It’s pretty surreal.”

In May 2016, Curry was watching the NBA playoffs on TV at the Brinks’ house when he lost track of time. Around 11 p.m., he decided to sleep on their couch instead of riding back to the team hotel.

The next night, after missing four games because of a knee injury, Curry posted 40 points, nine rebounds and eight assists in the Warriors’ Game 4 win over Portland in the Western Conference semifinals. When he drilled a three-pointer with less than two minutes left in overtime, Curry turned around, popped out his mouth guard, stared at Cameron sitting courtside and, while pointing toward the floor, shouted, “I’m back!”

Seth Curry, who is in his first season as a reserve guard for the Trail Blazers, tries to see the Brinks several times a week. For Saturday night’s Golden State-Portland game at Moda Center, the Brinks will wear jerseys that are half Seth’s Blazers jersey, half Stephen’s Warriors jersey.

“We can’t pick sides,” Michelle Bain-Brink said. “They’re both family.”

Connor Letourneau is a San Francisco Chronicle staff writer. Email: cletourneau@sfchronicle.com. Twitter: @Con_Chron