Three Curwood family members are present:
Back row, 2nd left - Ernest Walter Mason Curwood (great-uncle, 1866-1952)
2nd row from back, 2nd left - George Curwood (grandfather, 1873-1935)
2nd row from back, 5th left - Stephen Joseph Hunt (great-uncle, 1876-1945)
Can anyone identify any of the other players?
Again the date is uncertain but from the appearance of the known players and their dress, pre-World War 1 seems likely.