He hadn't expected to win. His mother tended to beat him unless he caught her off guard enough and he'd already set rules. But that was all in the, well, future, and this Carol Danvers didn't know their play style yet. That was fine. It was still fun, even if she smoked him in the end. As expected.
But when she stopped to gloat (or so he assumed, because he would have done the same), Steven barreled into his mother to tackle her to the ground in their version of an overjoyed hug. Steven laughed and didn't immediately let her up. "Congrats, Mom, it's a boy!"