If there is no survivor depends on your income, then you don't need life insurance.
Have you seen the cost of childcare lately? Add that along with housekeeping, food preparation, home accountant, and school transportation. From that list alone one can see how much a spouse really contributes to the household budget. It is estimated a non-working spouse contributes at least, but usually more, the equivalent of a full time job. For this reason it is important to buy life insurance for everyone in the household if the absence of their income would cause a financial hardship.