While searching on FamilySearch, I stumbled upon a book held at the Onondaga County Public Library, called "An index for genealogical research : comprising 10,000 names of persons given in the first book of vital records of the township and village of Moravia, Cayuga County, New York, covering the period from 1880 to about 1910". This is a 55 page book you can browse through on FamilySearch (click here).
In this book, Charles Leonard's family is mentioned on pages 28 and 29 as follows: (Note: the B, M, D after the name indicated it is a birth marriage, marriage record, or death record, followed by the name of the affiliated or related person).
The following names are mentioned, along with the record type and other people named on the document:
Sophronia Knapp (Marriage) Charles Hastings
Barbara Leonard (Marriage) Horace Main
Charles Leonard (Marriage) Lewis Leonard
Ethel Leonard (Birth) Jennie Bross
Jam [Jan? Jenette?] Leonard (Marriage) Winfield Reynolds
James Leonard (Marriage) Horace Main
Marinda Leonard (Death) William Matteson
Martin Leonard (Death) Buren Leonard
Susan Leonard (Marriage) Arthur Brown
Susan Leonard (Death) Harris Canavan
Susan Leonard (Birth) Mary Canavan
Susan Leonard (Marriage) William Canavan
Susan Leonard (Marriage) Fred Matison
There are no dates given in this book, except that the rcords are dated from 1880 to about 1910. For more information about these records, contact the Moravia town clerk's office or the Cayuga County Courthouse. Please share what you learn with us!