An adjustment for cost of living, not quite a pay raise. But if you can get them to pay, then yes!
Do you have kids? Then you need them to pay for
International Schooling. Prices vary, but in Singapore ~SGD$30k a year is a good ballpark. The important thing isn't that the private school is better (They're often not, but that's a hugely debatable point), but that they will follow the same curriculum of the schools in your home country. When you return, the kids won't be screwed. For example, a year or three ahead in math, but a few years back in other subjects.