On the 1910 census Harvey Sholes, age 62 is living in Smyrna, Chenango Co. with wife Louise E., age 45 & son Hiram, age 32. Harvey & Louise have been married for 19 years & she has not had any chilrden. On the 1880 census Harvey Sholes is living in Eaton, Madison Co., NY with wife Louisa, age 24, & the three boy you mention. It looks as if this Louisa is Harvey`s first wife & the mother of the boys. She evidently died sometime before 1890/91 when Harvey married # 2, Louise E. You could check with the town clerk in Eaton for a death record. NY state started requiring death certificates in 1881 & reporting was spotty until much later but you might get lucky.