Hiya I am not sure if there is a connection because I have almost NO information on my Belfast roots
What I found out today, that my grandfather, Alfred Wilson is buried in Belfast City Cemetary. He was married to a Mary Vance and passed in 1944.
In the same grave I have learned that there is a James Martin buried, that passed in the 60;s.
I wonder if your Martin/Vances are the same Vance's on my grandmother's side? Grandma was born around 1911,and I am aware of one brother, James Vance, and a sister Nellie (not sure if that is her proper name). Nellie married a Callahan....May have been in 1915 if her first name was really Ellen