Awww... that must be tough... ._. Did you explain to them why you don't really want to eat their dinner anymore? If you did...and they still don't understand, I don't really know what else you can do.
This is a really far fetched idea, but I can imagine it working: How much work do you do around the house? I know that in my case, I don't really do much at all o___o oops! >__>;; But ever since I started my dieting, I've gotten more energy, and I clean a lot more. Maybe if you started doing a bunch of stuff around the house, like dishes every night, or vacuuming or something, they would see that it's really doing good for you? I know that when I started helping out more around the house, people got a LOT nicer to me. And if they ask why you've suddenly started helping out, tell them that you have a lot more energy recently, probably because you've been eating healthier.
Like I said, far fetched, but... I dunno, I think it may help? >.o That is, if you don't do stuff around the house already, like I didn't just recently.
And with the meals, if they really won't compromise, maybe eat just a SMALL bit of what they cook? That's what I have to do, because my boyfriend's dad gets really angry if people don't eat his food. So... I just eat really, really small portions.
For those gourmet dinners, are they kinda like lean cuisines? I don't actually eat the on brand lean cuisines, they're like, Michelano's or something? xD Heck if I know. But they're really filling, and like $1.50, and usually only about 300 calories. If you have some extra veggies with them, omg... so filling, so few calories.