┌─Alexander Lockhart
┌─John Lockhart
│ │ ┌─Richard Bannatyne
│ └─Janet Bannatyne
│ └─Margaret Kennedy
Margaret Lockhart
│ ┌─William Cunningham
└─Marion Cunningham
│ ┌─Humphrey Colquhoun
└─Helen Colquhoun
│ ┌─William Graham ⇒
└─Helen Graham