Steph Curry on what it's like to play against his brother

The Golden State Warriors star told ESPN: "I can't turn off that human nature, in that moment, to root for him, even if I know it will hurt me."
2:29 | 05/16/19

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Transcript for Steph Curry on what it's like to play against his brother
Now to the NBA playoffs. The eastern conference finals tipping off last night with the Milwaukee bucks taking game one against the Toronto raptors and out west all eyes on the sibling showdown between Steph and his brother Seth curry as the warriors take on the trail blazers tonight. In game two and Paula Faris is here with more. He talked about this little thing calling on court sibling He has a special message for his mother too. The first time, yeah. It's the first time in NBA history the brothers have faced off in the conference finals. A family is torn. A family is nervous and Steph is calling out his mom. First brothers to face off against each other in a conference final. Reporter: It's Steph versus Seth. Tight-knit brothers both fierce competitors and Steph telling ESPN's Rachel Nichols this playoff match-up hasn't been easy. So when he's running down the court and launches a shot, what are you thinking? I hope it goes in, I hope it doesn't go in? When I was guarding him yesterday I had a corner three in.of our bench and it's such a mixed -- I can't really turn it off to be honest. Really it's like, I'll be okay if he makes this one. Reporter: Rooting for their sons dad Dell and mom Sonia. All I see is straight Portland across her Jersey. I'm just confused like really surreal type of moment. So I yelled up something to her. Ha did you say. Who you with? Who you with. Reporter: The rivalry has been brewing for years as Seth discusses in a new episode of the exclusive Facebook watch series Stefan versus the game released today. I had that competitive drive to be as good as him and beat him in everything. That's what drove me every day, I got up to try to beat him. Reporter: Steph says it's weird playing against his he can't turn off the desire to cheer for his brother even though it may hurt his team if he plays well so a lot of complicated emotions but you got to feel for mom and dad. I mean, is there really a winner? Talk to Serena and Venus' family. I think they'll be okay either way. I feel bad for Steph because he realized just a game and when the game is over he better deal with his momma so he better not call her out. His mom didn't hear during the game so he told her after. What was the answer? Both of you. Both of my sons. All right, Paula, thank you so much. And be sure to tune in to ESPN tonight at 9:00 P.M. For game two of the western conference finals between the warriors and the trail blazer.

This transcript has been automatically generated and may not be 100% accurate.

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