Jurassic Park is my go-to answer whenever this question comes up.
Michael Crichton is… let’s say, not great… at writing female characters. (At least women and girls. He did OK with the dinosaurs.)
In the book, Lex is the younger sibling. Timmy is the dinosaur fan and the computer expert, borderline Marty Stu. The computer stuff Lex does in the movie? That’s all Tim in the book. Lex is just a whiny brat. By the time I was 1/3 of the way through the book I was rooting for the dinosaurs to eat Lex.
Jurassic Park is my go-to answer whenever this question comes up.