Looking for John Copeland Harris Father

My grandfather John Copeland Harris was raised by family
last name is McCoy in Blanco Tx

The story told is that his fater was killed in a indian raid
I found a John Harris in Blanco in a tax record from 1868-1870
But not after that

In a 1880 census in Blanco my grandfather and his brother with
family McCoy
I found at ancestry.com world tree John Harris Died Texas also
had a spouse Named Lila Cravens B:1845 Died Texas 1875

Cannot find anymore