No, you should not claim your child's income and your child will not need to file since his income is below the filing threshold for dependents.
(Since your son had earned W-2 income, you cannot claim his income on your return which is fine since he will not pay tax on any of his income.)
The custodial account might now be transferred to his ownership since he turned 18, depending on the state. For some states it's 18 and others it's 24.
HERE is a TurboTax link that explains when it does, and when it does not, make sense to include a dependent's income on your return.
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