More family history

Following on from yesterday I have managed to find 4 photos of great grandparents.
At the top my paternal grandfather's parents
William John Milligan 1845-1918 and Mary Eliza Milligan 1856 - 1932.
At the bottom my maternal grandfather's parents.
Charles Penney 1851 - 1917 and Jessie Franklin Penney 1866 - 1944.