Thipu1, I didn't know that you and I had the same family. This sounds exactly like me when I was faced with the prospect of a week-long "vacation" at a resort with the whole family plus my two nephews, one of whom should be named "Damien". My excuse became fairly creative--"Whoops, sorry, no can do--I've got to look after the kittens so that Mehitabel (my older and Orson-Welles-like cat) doesn't eat all of their food and promptly explode!"--but oddly enough it was true. Besides, I had to look after everyone else's houses (and cats) as well.
Yup. That's my story, and I'm sticking with it!
As I'm wont to say, I'd rather romance a goat than spend more than a minimum amount of time with SS nephew. (I've posted about him before, on the Special Snowflake thread.) Only I use another word in general to replace "romance"...
Congratulations on standing up for your sanity!