Descendants of Adam Williamson

Adam Williamson 1898 - 1975
  m: Jessie Dalgarno 
     |---- George Adam Williamson 
     |      m: Joan Gwendoline Pettigrew 
     |         \---- Virginia Williamson 
     |                m: Andrew Preece 
     |                   |---- Rebecca Preece 
     |                   \---- Isaac Preece 
     \---- Alexander Williamson 
            m: Annie McDonald 
               \---- Ian Williamson 
                      m: Ishbel McPherson 
                         \---- Michael Williamson