The way we have the St. James-Cohen-Chang family set up is sort of like The Brady Bunch. They each brought in kids from previous marriages. Jesse has Fiona, Damon, and Jude who are of European descent, Tina has Jasper and Leigh who are both full Asian, and together they had Kimora, who would be considered half of each. Looking up Sam Tsui’s background, he’s split down the middle, so realistically he’d fit in as their mutual child, but even if we did gender swap the kid, Sam doesn’t really look like he can pull off fifteen.