Thought I would respond in hopes that you can also assist me. According to the LDS website, James and Rachel(Austin) Cosart are the parents of Sylvester, James and Lucinda Cosart. James was born in Virginia and Rachel was born in Knox Co., OH. James and Rachel were married in 1834 and the children were also born there.
The 1880 Census shows that this family moved to shelby County along with other Cozart family members. It appears they became farmers.
I have that Sylvester had a son by the name of Dudley who was married to Jessie Torrence and they had 5 children. Jessie died in 1931 and Dudley remarried to a woman by the name of Kate. Do you know anything about this branch?