What information do you have? Have you tried the online phone directory? The free one? If you know the city you could put an ad in the paper. Have you asked all family and friends what they know about them?What they do for a living.oh wait.. just remembered if you send a letter to social security they will forward it to the lost family members. I dont know if you need to know their ss no. or not. I did this a long time ago and forget. hope this helps you.

Yes, I suggest looking on the on line phone directory. You could also check with the library (you can email) to see if they would look in their most current city directory for your names. If the names are the same, and you have the address where they live, than you could cross reference with the phone number.

Also, look for the obit of your lost cousins parents, or relatives that might mention the place they were living in California. You could check with the library to see if they could help you.