Listening to the interviews or reading the transcripts of them, write down relevant information. Make a family tree using a family tree form or genealogy software. Read an introductory how-to book on Jewish genealogy and join a Jewish genealogical society. Search for documents. Vital documents like birth, marriage, and death records can fill in missing names and dates.
City directories can provide addresses.
Search for family in the U.S. Census. The census asked people when they immigrated to the United States and when they became naturalized. Learn about the historical context in which ancestors lived. This knowledge will provide insight into the way ancestors lived and the decisions they made. Family history research is both challenging and rewarding.