The information I have is Greenberry's first wife was Hannah Helton. Married 1833 They had eight children:
James 1834
John Franklin 1837
Mary Ann (Polly) 1839
Nancy 1843
Sarah Elizabeth 1847
Alexander 1848
Isaac 1850
Pierce 1853

Mary Martha (Polly) Horton was his second wife. Somewhere I think I remember someone said he might have had a 3rd or 4th marriage.

So guess that means we are not related :-(.

Hope that helps.
Reo