May be the David RUBY mentioned as a child of his sister in the will of James W. Scott of Greene Township, Mercer County, PA - Butler County Will Book Volume - M page 354 year 1895. It stated in part, "...children of my sister Rachel Peffer, except David Ruby, by her first husband George Ruby. The children by her second or any subsequent husband not to share in same..."

Individual found on 1880 census for Lancaster, Butler Co, PA living in household of his uncle, P. Scott. He was age 17.