Dear Liftnot
If you are a family man with kid(s) then I think you will struggle to maintain any kind of reasonable lifestyle in Singapore on a total package of S$90k (after the accommodation allowances run out)
After tax that comes to something around SGD6800 per month which wouldn't be much to cover accommodation, school fees, utilities, subsistence etc, let alone allow you to save anything.
If you are single you could probably get by OK but wouldn't be living in luxury by any means