Hello Barb,
So, DNA studies don't prove specific relationships. However, the census records document the later relationships pretty well. Early relationships are documented by other records. Phillip Starr's relationship to his father Jacob in Lincoln County, NC is based on a land record. Phillip's relationship to his children is documented via a son's estate records.
The Guilford Co., NC Starr brothers (Adam, John and Jacob) are proven to be related to Casper Starr who came out of Virginia into Rowan Co, NC via DNA records.
It is believed that Jacob of Lincoln county is the same fellow as Jacob of Guilford Co. We have only recently located a male Starr descendent of Jacob willing to participate in the DNA study. Many of Jacobs descendents daughtered out.
-vicki