Jennifer/jane was born Nicholls, married Lt James Nankivell 1820. they had a total of 13 children, there are 3 Nancy Nankivells, I'm assuming the one born 1826 and married james Gerry is yours?
Nancy Nankivell
Event Type: Baptism
Christening Date: 27 Apr 1826
Christening Place: Tavistock, Devon
Father's Name: John Nankivell
Mother's Name: Mary Nankivell
The father John married Mary Bawden/Bowden1809 with 7 children that we know of. I'm afraid the Nankivell researchers cannot agree on where the 'John' fits in.