As noted, the RFPA only applies to requests/demands for information from the federal government. However, your state may have it's own privacy statute or even rules of civil procedure that dictate how you handle third party claims for information. You may want to re-post your question, sans RFPA references, in your state's forum.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.