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

Depending on how many people there are, what are your needs and wants. For some, they can't do without a car, others may be content with just basic needs such as meals and a shelter. No amount of money is every sufficient. Earn more, spend more. It totally depends on you. For a family of husband, wife, toddler and a baby. $1.5knett is possible.