In the 1880 U.S. Census, Granville was living with his parents in the 4th District [Woolery] of Carroll County, Maryland, and he was a "painter."

Granville married Mary S. (Miller) Bankert (5 Mar 1870 - 15 Sept 1940) on 23 Dec 1887 in Carroll County, Maryland.

In the 1900 U.S. Census, Granville and Mary were living in Hagerstown, Washington County, Maryland, and he was a "cabinet maker."

In the 1920 U.S. Census, Granville and Mary were living in East Pennsboro Township, Camp Hill, Cumberland County, Pennsylvania, and he was a "steelworks millwright."
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Granville and Mary were also the parents of Hazel S. Bankert (born Oct 1891). She was born in Maryland.

Granville's sister, Clarissa (Bankert) Berry (born Oct 1869), married G. Worthington Berry (born c.1857) on 18 Oct 1890 in Waynesboro, Franklin County, Pennsylvania. He was born in Maryland to William H. and Susan R. Berry. In the 1900 U.S. Census, Clarissa was a widow. Worthington and Clarissa were the parents of Karl Bankert Berry (born 27 June 1893).
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The obituary for Granville was provided by #46591637:

Harrisburg Telegraph
Harrisburg, Pennsylvania
19 Mar 1942
Carlisle, March 19

Granville O. Bankert, 87, died Tuesday at the Burkholder Convalescent Home, Carlisle, R.D. 6.

He was a member of the Grace United Brethren Church and is survived by two daughters, Mrs., G. Leroy Moorehead, New Bloomfield, and Miss Hazel Bankert, Carlisle; a sister, Mrs. Worthington Berry, Washington, D.C.; three brothers, John Bankert, Hanover, and David Bankert, Waynesboro, and two grandchildren. [note state 3 brothers, but only names 2]

Services will be held at 11 a.m. tomorrow at the Lutz Funeral Home. Burial will be in Westminster Cemetery, the Rev. Paul R. Koontz officiating. Friends may call tonight at the funeral home.