Are you talking about life insurance? A 401k? A will?
You should have a Will that includes a basic trust to hold money for the kids until they reach an appropriate age (beyond 18) as non-adults can't take property so if it goes to them directly, the court holds it for them and they get it at 18 and buy a car and super sound system.
Then for the insurance you could name the trustee for the kids under your will and thus add the insurance or 401k proceeds and the trustees would add and hold the money for the kids and be able to pay the kids' expenses, tuition, etc. with the money going to them upon age 25 or college graduation or what ever event you set for them to take control.
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