Quote Quoting Frisbee
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My question involves name change laws in the State of: California

Can my wife's two daughter legally go by my last name? As they wish to have the same last name as us and not their fathers. With out going to court until they are actually of age to change it themselves
Nope. If Dad doesn't consent, Mom has to take it to court. You and Mom are free to change your last names, though...