There is a John Hurd that appears in the 1900 PA Census Allegheny County, Pittsburgh City, Washington Avenue, dated 5 Jun 1900:
Hurd, John, Head, Mar 1849, 51, Married for 25 years, Born in PA, Father born in PA, Mother born in Germany, Steel tamperer
Hurd, Karoline, Wife, Nov 1854, 45, Married for 25 years, Mother of 6 children, 4 still living, Born in PA, Parents born in Germany
Hurd, Henry, A., Son, Sep 1877, 22, Born in PA, Parents born in PA, Toolwork laborer
Hurd, John E., Son, Jan 1884, 16, Born in PA, Parents born in PA, Laborer
Hurd, K. Mabel, Daughter, Mar 1890, 10, Born in PA, Parents born in PA, At school
Hurd, Raymond, Son, Jul 1893, 6, Born in PA, Parents born in PA, At school
This information doesn't completely match with the information that you provided. However, the family does appear in the 1880 Census living with the father of John Hurd's wife.
From the 1880 PA Census Allegheny County, Pittsburgh, Twelth Street, dated 8 Jun 1880:
Wolfrum, John, Self, 56, Widowed, Huckster, Born in Baden, Parents born in Baden
Hurd, John, Son-in-Law, 30, Married, Works in glass works, Born in PA, Father born in PA, Mother born in Baden
Hurd, Caroline, Daughter, 26, Married, Keeps house, Born in PA, Parents born in Baden
Hurd, Henry, Grandson, 3, Born in PA, Parents born in PA
Hurd, Edward, Grandson, 3 mths., Born Feb of that year, Born in PA, Parents born in PA
There is a Henry Hurd who appears in subsequent census listings in Pittsburgh, but his wife's name is listed as Louisa, and they have the following children: Harry, John, Ruth, Mabel, Charles, Walter and Lewis. I provide this information so that you can make the determination whether or not this is your line.
Best of luck with your research.