I live in NZ and my lovely SIL and husband are suggesting a visit to us when babe will be four months. They came last year before we were pregnant and brought their daughter, 23. Flew her business class, arranged their whole trip around her skiing demands. The whole visit was really stressful what with her demands, behaviour, refusal to take part and expectation that we would buy her drinks and special foods. Basically a toddler in the body of a 23 year old.
SIL has suggested that the niece come with them next time too. I don't want her in my house and will not be able to be nice to her and that will make SIL sad. It would just be nicer if she wasn't there.