This brief family tree will explain the relationships of the people in the photos.
Edward W. Wilkinson (1846 - 1918) married Mary Zimmerman (1842 - 1917) in 1867, they had four children: Minnie, Mae Belle, Harry J. and Nellie.
Minnie Wilkinson (1868 - 1870) never married, had no children
Mae Belle Wilkinson (1872 - 1949) never married, had no children
Harry J. Wilkinson (1873 - 1945) married Teresa F. Wervey (1878 - 1967) in 1902, they had three children: Mary Teresa, Edward J. and Frederick E.
Nellie Wilkinson (1878 - 1956) married Gaylord W. Bahl (1868 - 1949) in 1901, they had three children: Gaylord W. Jr. (1903 - 1988), Jacob Pierpont (1904 - 1993) and Charles Edward (1907 - 1996).
Samuel M. Wilkinson (1837 - 1900) was Edward's oldest brother. Samuel married Carolina Valenzuela (1855 - 1880) in 1874, they had three children: Anna Marina, Marie J. and Emilio.
Edward had one other brother, William Henry Harrison, and four sisters, Isabella N., Cecelia Emma, Annie E. and Clara B.
John Riley Robinson (1810 - 1892) married Jane Wilkinson (1813 - 1883), the sister of Edward's father, in 1836.