Reuben Fletcher Miner was born in 1836 in Seneca County. Carrie Miner the youngest listed child of Samuel and Lucinda was born about 1838 somewhere in New York.
Widow Lucinda Dunham remarried Jonas Winchell 1838 in Camillus, Onondage, New York. Their first child was born in 1839 possibly in Cayuga County. The rest of their children were born in Onondage County.
First look in Onondage County since that is where Lucinda remarried in. Second check Seneca County, since that is where Reuben was born in 1836. Then last if not in either of Onondage or Seneca County try Caygua since there is indication he may have lived there.
Onondage County
Title: Appointment of guardians, 1824-1960
Index to guardian records, L-Z 1824-1960 FHL US/CAN Film 873239
Appointments of guardians, v. A-B 1824-1840 FHL US/CAN Film
Title: Wills, 1796-1867
General index to probate records L-R 1802-1923 FHL US/CAN Film 873187
Wills Vol. D-E 1821-1834 FHL US/CAN Film 873190
Wills Vol. F-G 1834-1841 FHL US/CAN Film 873191
Seneca County
MF Roll: 843627 Title:General index 1804-1914 MF Roll: 843628 Title:Wills, v. A 1804-1838 MF Roll: 843667 Title:Minutes, orders, decrees, v. A1-4 1830-1849 MF Roll: 843675 Title:Letters; testamentary, administration, v. A3 1827-1850 v. C 1860-1876 MF Roll: 843678 Title:Administration, v. C-D 1815-1883 MF Roll: 843680 Title:Letters of guardianship, v. A-B 1816-1853 MF Roll: 843682 Title:Dowers, v. A-B 1829-1873