A lot of people don't understand trusts and what goes into them.We did wills right after retirement.
Went to a lawyer....a little pricey.
You can also set up a trust.
That may help out your kids until the mature.
*Lots of people do not like trusts.
Just as an example, first precedence on $ in any investment house is the beneficiary on the account, not a person scribbled on a piece of paper in a drawer.
As for the topic, my parents never made it clear on lots of details for FINAL arrangements, but have several trusts. I am now setting up more than just a family trust for spouse and I, because of this.