am trying to help my sister in law locate her birth father John Edward Jones Jr. Her father was adopted and his father Waldo (possibly Jones). He is/was a twin and has/had a sister Jeanette. He possible went to (no gone) Silva High School or Newark High School in Newark California. My sister in law believes that she has a half sister who she originally thought to be a cousin that her aunt was raising. His last known residence in 1974 was in California and he would have been in his early twenties. Any help would be appreciated. Any help would be appreciated.