John Carr, Esq. of "Bear Castle," Elk Run, Louisa County, VA.; He was born on
December 26, 1706 in Caroline County, VA. John Carr, who owned extensive
estates, was a Member of the County Court (Louisa) from its formation
in 1742 until his death, and served as High Sheriff in 1753-54.
Note: was his first wife Mary Garland or mary Dabney? Think his father was married to Mary Dabney
John Carr, Esq. was married twice. His first wife, Mary Garland, died March 10, 1736. Their son was Thomas Carr (b. Nov. 24, 1735), is recognized as the direct ancestor of the Carr line in North Garden, Albemarle County.
The second wife of John Carr was Barbara Overton (b. April 20, 1720, d. Dec. 1794), daughter of Capt. James Overton of Hanover. 
John Carr of Bear Castle, Louisa county, VA was born 1706. He died in 1778. He first married Mary Dabney, and they had one son Thomas. Mrs. Mary Carr died March 1736. John Carr married, secondly, Barbara Overton, daughter of Captain James and Elizabeth Overton, Dec 27, 1737. She died in 1794. John and Barbara had eleven children, of which six survived: 
Their other children were:
Mary Carr, b. 1756
Samuel Carr b.1765, d.1777
Overton Carr, b. 1752 married Ann Addison of Oxon Hill, MD
Garland Carr, b.1754, d.1837 married Mary Phillips (nee' Winston) in 1783
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It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with John: