I would advise caution about when to give the GC their bonus. Some 18 yr olds are too immature to handle it wisely or heed advice.
My friends husband was killed by maniac driver in a car accident, leaving no Will and two toddlers. The other drivers insurance made a huge compensation payout, and intestacy law required the childrens share of his estate be held in trust until they reached legal adulthood at 18.
At 18, the eldest was a wild child but there was no way to hinder her access to her money; she took it and ran away with an older man/ gangster . Within two years he and the money were gone leaving three lives irreparably blighted.