We were in touch with Roy Gange, of Salisbury until he died a few years back, also descended from Henry. My husband is descended from Thomas Gange, younger brother of Henry, and his cousin, once removed, Jane Barnes.
We have tried to track down descendants of all of the 13 children of James and Elizabeth.
Also the descendants of the other children of James and Susannah. As well as brothers and sister of James - we think we have his parents and have earlier Ganges in the same area, but it gets a bit more difficult before then, although a Gange family were in Puddletown back in the 1500's.
I am also in touch with other Gange descendants from other branches in Somerset/Dorset. I am in the process of putting their details onto Ancestry and will invite you to view. I have not found a link with them yet, but hopefully will one day.
Are you from Michelmersh? That is where James and Susannah married. She was originally from Cranborne, Dorset and he from Eling (we believe he was born in Portsmouth). When you are back home if you could let me know how much you want filling in, I will be pleased to do so. Although it may take a while. I have been doing the research over 20 years with Gange relatives in USA, Australia, Cumbria and with Roy and Edward from Salisbury.
Elizabeth did marry Charles Downer, but James' father was a John Spinkernell who did a runner. I will look out the info and send it to you. Have you got an email address?