@twizzay Are the in-laws paying for this?
If not, order an english menu, maybe they kick you out for that.
@twizzay I'm thinking "compensation for personal suffering" here.
After all, you didn't ask to go - ordering what looks best to you (not most expensive, that would be childish) is what i would call fair. They want to treat you? Let them do it the one way it might actually be enjoyable there. It's not like you'd get hooked on didney fancyfood and crave to visit again, is it?