Jacob's marriage to Susanna Cox was confirmed in her father's 1759 will. The will also indicates that Jacob and Susanna had more children than Jacob named in his own will in 1781.[1] Although Susanna's father Nicholas Cox did not specify which children belonged to which of his two daughters, he did appear to list them in order of age, with the first set of names belonging to his older daughter Susanna:[2]
...unto my two Daughters Susanna Mosby and Elizabeth Mosby...
Item to my Grandson Joseph Mosby I give twenty five Pounds Current Money
Item I give to my Grandson Stephen Mosby Twenty five Pounds Money
Item I give to my Grandson Samuel Mosby twenty five Pounds current Money to be paid him when he attains the Age of Twenty One Years
Item I give to m y Grandson Robert Mosby Twenty five Pounds Current Money to be paid him when he arrives at the Age of Twenty One Years
Item I give to my Grandson George Mosby Twenty five Pounds Current Money To be paid him when he Attains the age of Twenty One Years
Item I give unto my Grandson Charles Mosby Twenty five Pounds Current Money to be paid him when he attains the Age of Twenty One Years
Item I give unto my Grandaughter Agnes Mosby Daughter of Jacob Mosby Twenty five Pounds Current Money to be paid her when she attains the Age of Twenty One Years or Marries
Item I give unto my Grandaughter Phebe Mosby Twenty five Pounds Current Money To be paid her when she attains the Age of Twenty One Years or Marries
From there, the list of children begins with two boys who were over age 21 before again mentioning that the remainder need to reach that age to receive their shares. The second half of the list also includes an underage Agnes, which explains why Nicholas named only these two girls as daughters of Jacob and Hezekiah Mosby, respectively.
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DNA Connections
It may be possible to confirm family relationships with Jacob 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 some percentage of DNA with Jacob: