Looking at the 1900, 1910 and 1920 censuses, it seems that Vincent and wife had just the 3 children, the last 2 being Vincent(circa 1904) and Richard (circa 1908). The first child is called son Russ in the 1910 census (circa 1901) and is called daughter Fern (circa 1901, so same child) in the 1920 census. So, take your pick. Sue