I found the following in the 1900 census (volume 257, Enumeration District 106, Sheet 7, Line 55):
Head of household: Frank Losee, age 45, born 1855 in NY State, living at #4 Broad Avenue, Ossining, NY
Emma G. Losee, wife, born July 1853 in NY, age 46 Howard Losee, son, born May 1876 in NY, age 24 Leroy Losee, son, born January 1881 in NY, age 19 Ada M. Losee, daughter, born May 1883 in NY, age 17 Ethel A. Losee, daughter, born Sept 1885 in NY, age 14 Cyril Losee, son, born August 1887 in NY, age 12 Violette Horton, daughter, born August 1877, age 22 Edward Horton, son-in-law, born March 1878, age 22 Davis E. Horton, Grandson, born December 1899, age 9 months
Emma's maiden name was Dingee. There is also an 1880 census showing them in Ossining at the same address, but with only Howard and Violetta born, of course.
At some point after his marriage to Nellie Bach (approx. 1905), Howard moved to Yonkers.