Millicent West Hubbard was born in Sandusky on September 21, 1880 to Charles Livingston Hubbard and Jenna West Hubbard.
Millicent's paternal grandparents were Mr. and Mrs. Lester Samuel Hubbard. L.S. Hubbard was an early merchant and banker in Sandusky. Millicent's maternal grandparents were Mr. and Mrs. William T. West. W.T. West, along with his brother A.K. West, operated a store in Sandusky, and built the West House hotel in the mid 1850s. Millicent married Arthur Crosskill in 1907. They lived in New York City at the time of the 1920 U.S. Census.
On December 11, 1923, Millicent W.H. Crosskill was issued patent number 1,476,693, which was for a flour sifting utensil.
An article which appeared in the September 12, 1963 issue of the Putnam County Courier, from Carmel, New York, reported that Mrs. Millicent Crosskill had died on September 10, 1963. She was survived by two sisters. Funeral services for Millicent W.H. Crosskill were held at the Charles Andres' Sons Funeral Home in Sandusky, and burial was in Oakland Cemetery. Many of Millicent's ancestors were also laid to rest at Sandusky's Oakland Cemetery.