Quote Quoting CourtClerk
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Dad will need to be served. The child's grandparents will need to be served as well.

But your biggest hurdle is.... I want to change my child's name because I want him to have the same name as my new boyfriend. That's not going to fly in a california courtroom. And since your father has an idea of where he is, I'm sure he can help you locate him so he can object (and have his rightful day in court), and his side of the family probably knows where he is. you have lots of options.
Are you sure the bolded is correct?