How can I find a relative who came in on a ship 1st class in San Fransico, CA in the 1900's?

I am looking for a relative who came in on a ship 1st class with her husband and 3 children. I have the ship name with her on the ship's ledger and this would have been in the early to mid 1900's. I am trying to find out where they are originally are from?

Thank you

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