How to get out of going to dinner?

I don't wnat to go out to dinner. I just came home from vacation with my grandmother, my mom, my dad, and my sister and my mom and dad want to go out to dinner with me. We've went out to dinner every single day when we were on vacation and I REALLY don't want to go out today. They won't listen to me if I say "I don't want to go out to dinner, i've been out of town and I just want to stay in the house" or anything like that. Also, don't gvie me any crap about I should..I need EXCUSES.