Fact: Children and young people are bereaved more often than people think. In 2015 23,600 parents died in the UK leaving 41,000 dependent children. That is one parent every 22 mins. - Childhood Bereavement Network - National Statistics
This is the sum of money to be paid out in the event of your death. Perhaps all debts and mortgages could be paid off and maybe think of maintaining a certain lifestyle for your family.
Try to think about how long your family will depend on you for and when will they be able to be financially independent. If you're not sure, you can get advice and more quotes at the end