From History of Allegheny County, Pennsylvania:
(Louis Rott) In 1876 Mr. Rott married Arabella J. McCandless, who has borne him four sons: Louis Ed., Robert George, Charles H. and Albert J.
From Memoirs of Allegheny County, Pennsylvania:
LOUIS ROTT He was married, on July 19, 1876, to Arabella J., daughter of Robert McCandless, and they had three children: L. Edwin, cashier of the First National bank of Homestead; R. George, with the Homestead steel company, and Albert John, an invalid. Mrs. Rott died on Nov. 29, 1889, and, on May 17, 1891, Mr. Rott was married to Margaret Virginia McCandless, a sister of his former wife, and their wedded life has been a rarely happy one.
M > McCandless | R > Rott > Arabella J. (McCandless) Rott