By white kids i'm guessing you're talking about Tim and Lex....
My guess is their small appearance in this film is just to express their concern about what's happening with John... amplifying Ian's purpose into getting to the bottom of what's going on.
It gives a sense of time passing and the story moving on that given Jeff Goldblum's incredible ability not to age and Richard Attenborough looking and sounding much the same as well was needed for the scale of the story.
They're also shown to be as helpless within that family unit and household as they were in the original film. Showing that some of the real predators are within the company not the park.
Also deserved to get a bit of money because contrary to popular opinion I thought the kids were great in the first movie.
"Incredible ability not to age"...dude, it's only been 4 years from part 1 to this movie.
shareIt’s racist that the OP specified the children’s ethnicity.
sharelol why not just refer to them as “the kids”? Most of the cast is white.
The black girl, on the other hand…
sounds like you're a black dude that's a little racist towards white people, buster.