How much should a family earn in order to survive in Singapore ?

It really depends on each family needs and wants. Do they want to enjoy restaurants once in a while? Do they need to travel at least once a year and their destinations? How many kids do they have? Are they super hands on or required some help like FT or PT maid? Actually low income can also survive in Singapore, like stay in rental flat, eat very simple meals, dont splurge much, no extra leisure money and enrichment on kids.