The Hargraves of Pike Co. Indiana

I am researching the Marvin Debruler Hargrave family of Pike Co. IN.Marvin D Hargrave married Emma Davidson in December 1880.They had 3 children:1)Oswald born 1881-2 died 1893 2)Marna May Hargrave born March 1882 Died April 1926 (3) and Marvin Hoyt Hargrave born in 1886-7 and died in 1917 without issue.Marna is my grandmother.