One of my closest friends was divorced when her ex died at age 32 - they had 4 minor children. Because he died on-the-job, there was a workman's compensation settlement - there is a court appointed guardian who decides what - if any - of this money the mother may use to raise these children. Thus far, the <bleep> guardian has charged more in fees than he has allowed the mother to use. Since the ex had no Will, his assets were sold and are / were being held in trust for the children to receive at age 18. I knew the deceased pretty well and he would not be happy with this situation -- and it could have easily been prevented with a Will and bit of planning. Don't leave your children in similar circumstances - spell out who you want to be responsible for handling insurance proceeds on their behalf and how your assets should be distributed.
If you are older and have grown children -- spelling things out can prevent a war between the children. I've watched many of my deceased friends kids fight tooth and nail for the assets and keepsakes. We had our children put what they wanted in writing and the letters are with our Wills. We have nine kids between us and we don't want a war when we are gone. Since we each have children from previous marriages, we also do not want anyone trying to do anything like trying to force a step-parent to surrender treasured household items or assets before the step-parent passes on. Our Wills address that aspect as well.