The Harpers of Philadelphia

I am descended from William Harper (b. approx. 1865) and Mary Coward or Conrad Harper (b. approx. 1877). They had eleven children:

Reba R. Harper (b. ~1894)
Anna C. Harper (b. ~1895)
John H. Harper (b. ~1897)
Frank W. Harper (my great-grandfather - b. May 21, 1899)
Laura M. Harper (b. ~1902)
Mary C. Harper (b. March 16, 1904)
George B. Harper (b. October 22, 1907)
Katherine B. Harper (b. December 23, 1909)
Ida Harper (b. September 1, 1911)
Else? Harper (b. ~1914)
Edna Harper (b. ~1916)

Any information on these Harpers and/or their descendants would be most helpful. I would be happy to share information on my side of the family.

Looking forward to hearing from you!