I mean most of the characters/cast being children.
I thought so, but then I read it again, and --- please don't take this as any kind of aspersion upon yourself --- I wondered if it might have meant "films with majority (for the moment, thank you, contraception, abortion, and untrammeled border-breaching, it's not "immigration"!) white children".
It seems like anything you watch today, whether it is a TV show, a movie, or advertising, has to have a cast of all different races and ethnicities, with the blacks being placed in strong, sympathetic roles, women doing everything a man can do, a "Heinz 57" mix of sɛҳuąƖities, and if there is a villain, it is invariably a white male. It's all about the Benjamins and "wokeness". That's just how America rolls these days.
To the credit of the producers and advertisers, they also cast people with physical and intellectual disabilities, and I have absolutely no problem with that.