I currently have information about my great grandparents including names, birth and death dates, and have some census data that filled in where they lived.
What I don't know is ANYTHING about any great great grandparents. Where do you start to look? For instance, one grandparent was born in 1887 in Poland. Arrived in america in 1907 (based on a 1920 census). Future census mention his children, which proves its the correct person, but in a census there is nothing about their parents.
What could possibly lead to any information about older relatives?