If I'm in his shoe I'd leave the chick and her relative right away before eating in that expensive restaurant.

Good move.
I invited a Hmong chick to dinner one time some years ago and she brought her grandmother, a younger sister, a girl
cousin, and her teenage brother. I didn't walk off. But, luckily, the crew's meals that night totaled only $95.00 at
Peking Garden.
I never got the courage to talk to her again though.
She probably thought I was so into her to have invited her to dinner. But little did she know that this dinner
determined whether there would be a second.
Some people do take advantage of such situations. But I think we need to watch our diets.