I am in the same boat as you but for a different reason. Eating out for me is a release and a source of relaxation. It has became torture for me now that I am trying to lead a healthier lifestyle because there are so many "can't have that" on the menu. Basically, I adopted 2 habits that allow me to eat without so much guilt or torture.

-Eat very slowly and enjoy every bite- I found that when I eat slowly I fill up ALOT faster than I did when I would wolf down an enormous burger and fries. Now I eat barely half of the burger and and even smaller amount of the fries. What's great is that I still got to taste the flavor of the food, but my bodies' intake self regulation was able to take over. A close friend of mine told me about this approach and it really worked for me. I can't say it will be the same for you, but you could always give it a shot.

-Don't be afraid to leave food on the plate (or in my case take it home)- I have huge problems with leaving anything on my plate. It's the way I was raised. All those starving children in Africa I suppose... Rather than outright leaving food on my plate I ask for a doggy bag. It is a nice compromise for me.

This is what works for me. I can't say it will make you want to eat out more, but try to focus on spending quality time with your family when you are there rather than fretting about the food you are going to eat.