Answer:
The error in the sentence is that it should be "helps" instead of "help".
Buying a life insurance policy helps to ensure that your children have a measure of financial security in the event of your untimely death. A life insurance policy can provide a lump sum of money that can be used to pay off debts and other expenses, such as college tuition or mortgage payments. It can also help to ensure that your family is able to maintain their standard of living in case of your death. Finally, a life insurance policy can provide peace of mind to your family, knowing that even in the case of your unfortunate death, they will not have to worry about a lack of financial security.