Mary Todd Lincoln as my 6th cousin, 6 times removed is one generation away from confirmation on my pedigree chart that was proposed.  Our MRCA, Agnes Devey (1559-1639) would be my 10th great grandmother.   I have verified up to what is defined as her daughter, Elizabeth Pitts (1624-1696), my 9th great grandmother.    I found that I am also one link off in my connection to Mary’s husband, President Abraham Lincoln as my 6th cousin 4 times removed, though a different MRCA, Thomas Betts (1602-1688), who would be my 9th great grandfather.   I have verified through what is defined as his daughter, Hannah Betts (1652-1688), my 8th great grandmother.  It is complicated.