Sharon, we know that Abraham, grandson of the Signer did have 7 children. the youngest is Lydia, b. c. 1833. Josiah is shown as b. c. 1819 and there is no additional information on Josiah. In fact, except for James Jackson, we have no additional details on any of the children. The dates you show vary a bit from our birth dates, but all the birth dates are of the born circa notation. IF you can send me a specific reference to how to get to your tree, I will take a look at it.

Jim