Is improper etiquette to order an entree with meat when eating with vegetarians?

My mother, sister, & I are eating dinner with my Indian boyfriend’s devout vegetarian parents this weekend for the first time, but we’ll be eating out. I REALLY want to add to the good impression I’ve been working on for the past five months since I’m a blonde American that they aren’t particularly fond of their son dating. Should I play it safe or will it even matter?