California considers your son's domicile to be California therefore, he is a resident of California and would file a California resident return. When TurboTax asks what state your son is a resident of the answer is California. Residency in California is determined by where your domicile is. Your son's mailing address has no bearing on his residency status it is used for the purpose of where to send forms and information, not as a factor in determining his domicile. California is one of the few states that use domicile in determining residency for tax purposes.
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