I also didn't buy his crying when he talked about their parents. Speaking of...they could've done without that whole subplot. It really took away from the film.
That was one of the complaints I presented to someone today. I just didn't understand why they bothered to add that to the film when they completely dropped it soon after. I know there was a brief moment early on that gave you suspicion, but it wasn't that obvious. Then they go into this scene to give some form of back story to these two characters, and it's never brought up again.
It didn't make me care about these two characters more. It was a random piece of information that was never elaborated upon further and we never hear anything more of again.
Honestly, the entire opening of the movie up to the moment to the kids reach Jurassic World felt rushed and poorly thrown together. That did feel like I was watching a trailer for the film.