So, the amount of life insurance on that person would usually depend on the person's own income, not the combined income for a family.
However, both spouses may buy life insurance and have their own term life insurance policy naming the other spouse as the beneficiary if they were to die.
In that case, you would consider how much life insurance you need for each individual spouse if the other spouse were to pass away.
Sometimes people choose to buy up to 7-10 times their annual income in life insurance. However, a better way to determine your life insurance needs is to use a term life insurance calculator.
You just answer some questions about your financial situation and the calculator gives you an accurate estimate of your life insurance needs based on your current financial situation.
Here's a quick and easy term life insurance calculator you can use right now to find out how much life insurance you need.