Basking in the glow after becoming the second-youngest player ever to win one of golf’s top prizes, Jordan Spieth was all too happy to talk about his sister with special needs.

Over the weekend, Spieth soared over golf’s better-known names to win the Masters with a score of 18 under par. The feat quickly put the 21-year-old in the same sentence with the sport’s longtime star, Tiger Woods, who also won the tournament at that age.

After sealing his victory at the famed Augusta National Golf Club in Augusta, Ga., Spieth looked forward to telling his sister Ellie, 14, who is on the autism spectrum, about his win. The younger Spieth didn’t make it to Augusta for the Masters, but did get to see her brother play at the Houston Open earlier in the month.

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“She’s just going to be happy that I won,” Spieth said. “She was out there in Houston and after each round, she said, ‘Jordan did you win, did you win?’ I said ‘not yet, not yet’ and then ‘no.’ So I can tell her I won now.”

The comments came in between questions about everything from his performance at the Masters to the future of golf.

It’s not the first time, however, that Spieth has opened up about his relationship with his sister.

“Being Ellie’s brother humbles me every day of my life,” the golfer says on his website.

And Spieth’s mom, Chris Spieth, credits her daughter’s challenges with keeping the golf champion grounded.

“Jordan wouldn’t be where he’s at today if he didn’t grow up with Ellie,” his mom, Chris Spieth, told ESPN. “Jordan realizes this isn’t real life at the Masters. Trying to sit around and have dinner when his sister doesn’t want to eat when everybody else is eating and has a fit, that’s real life.”