Below is the relationship to Mary Todd Lincoln to Elizabeth Todd Carr. Also here is a site regarding the Lincolns, emphasis on Mary Todd.
http;/members.aol.com/RVSNorton/Lincoln15.html
Ancestors of Mary Ann Todd
Generation No. 1
1. Mary Ann Todd, born December 13, 1818 in Lexington KY - to IL in 1839; died July 16, 1882 in Springfield, IL. She was the daughter of 2. Robert Smith Todd and 3. Eliza Ann Parker. She married (1) President Abraham Lincoln November 04, 1842 in Edwards Mansion, Springfield Sangamon Co IL. He was born February 12, 1809 in Sinking Spring Farm nr Hodgenville Hardin Co( now Laural, KY, and died April 15, 1865 in Washington DC. He was the son of Thomas Lincoln and Nancy Hanks.
Generation No. 2
2. Robert Smith Todd1, born February 22, 1791 in Lexington KY; died July 15, 1849 in Lexington KY-cholera. He was the son of 4. Gen Levi Todd and 5. Jane Betsy Briggs. He married 3. Eliza Ann Parker November 26, 1812.
3. Eliza Ann Parker, died in -died July 25 (?) in her 30st year-. She was the daughter of 6. Robert Parker and 7. Ellizabeth Porter.
Children of Robert Todd and Eliza Parker are:
i. Elizabeth P Todd, born November 18, 1813 in Lexington KY; died February 22, 1888 in Sprinigfield IL; married Ninian Wirt Edwards February 18, 1832 in Lexington KY.
ii. Francis Jane Todd, born March 07, 1815 in , KY; died August 14, 1899 in Springfield, IL; married William S Wallace May 21, 1839; born August 10, 1802; died May 23, 1867.
iii. Levi Oldham Todd, born June 25, 1817; died July 18, 1864; married Louise Searles.
1 iv. Mary Ann Todd, born December 13, 1818 in Lexington KY - to IL in 1839; died July 16, 1882 in Springfield, IL; married President Abraham Lincoln November 04, 1842 in Edwards Mansion, Springfield Sangamon Co IL.
v. Ann Marie Todd, born 1824 in Lexington KY - toSpringfield IL after 1802; died March 21, 1891 in California; married Clark Moulton Smith; born May 10, 1820; died July 28, 1885.
vi. Robert Parker Todd, born 1820; died July 1822 in - age 14 months.
vii. Dr George Rogers Clark Todd, born July 1825 in Lexington KY; died Abt. 1902 in Camden SC; married (1) Martha Belton Lyles; married (2) Ann H Curry.
Generation No. 3
4. Gen Levi Todd1, born October 04, 1756 in Montgomery CO PA - to KY 1776; died September 06, 1807 in Fayette Co KY. He was the son of 8. David Todd and 9. Hannah Owen. He married 5. Jane Betsy Briggs February 25, 1779 in Kentucky.
5. Jane Betsy Briggs, born June 03, 1761 in PA; died June 22, 1800. She was the daughter of 10. Samuel Briggs and 11. Sarah Logan.
Children of Levi Todd and Jane Briggs are:
i. .
ii. Elizabeth Todd, born 1782; died October 1875; married Charles Carr 1803.