The little numb feeling in your stomach

Flesh

My dad, Samuel, and Chad get in his jeep and they pulled away. I turn around and the little girls aren't at the camp site. So I walk to the tall tin vehicle and open the door, when a small scream came from the backseat. Seeing the little girls I say,"its just me," smiling. The older one rolled her eyes, so my face dropped and I slumped in the passenger seat. After a few moments of silence I said,"I'm Milan, like the city in Italy, and who are you guys?"
The younger girl was asleep so the older one answered,"I'm Sarah, and this is my younger sister Indonesia. Before you ask, she's nine, I'm twelve, you're probably eighteen-"
"Seventeen," I cut her off.
"Great, so I didn't want to be stuck here with someone I don't know, with old grandpa bones-"
"Oh they're older than that!" I tried to say in a fun way but she just looked at me with annoyed expression.
"Listen.. Just don't talk to us, ok?" She said finally. Ouch. I should of just taken the hint.
I laid down to rest, but sketchy movement from the back seat woke me up, it was just them shuffling around.
I looked down on my video screen, my dad looked horrified, so I gave him a confused look and he put his screen in front of the camera. The dinosaur bones... Were moving...? He quickly scribbled down letters that said "get to the campsite, there's a sand/rock cave. Now."
I looked back at them sleeping soundly, they would only slow me down....
I snuck out of the vehicle and started for the cave. I looked at my video screen and it looked like Chad and my dad were on their way back here.