You're welcome! Here's some info I copied from the Interment.net page on Beverly cemetery.
Postell, George, b. 10/10/1891, d. 03/30/1955, PVT CO F 813 PION INF, Plot: P 822, bur. 04/05/1955, * Postell, Henry Fleetwood, b. 08/13/1916, d. 09/10/1957, S/1 USNR, Plot: J 2108, bur. 09/16/1957, * Postell, James, b. 09/17/1895, d. 01/26/1951, PVT BTRY C 349 FLD ARTY 92 DIV, Plot: K 836, bur. 02/02/1951, * Postell, Jesse, b. 01/23/1919, d. 02/02/1953, PFC SQ C 902 AAF BU AC, Plot: L 234, bur. 02/05/1953, * Postell, Mattie Mae, b. 09/20/1929, d. 01/21/1959, Plot: L 4596, bur. 01/27/1959, * Postell, Rose, b. 07/23/1900, d. 05/27/1956, Plot: P 823, bur. 06/04/1956, *
It seems your Rose is buried there as well as others. One is the right age to be George's brother (possibly - it's only a clue) and the other two possibly sons or nephews.
What's interesting to me is that this possible brother's name is James (MY George's father's name) and one of the sons/nephews'(?) names is Henry (MY George's middle name) which makes me think this may well be related to my line. It would be interesting to learn YOUR George's father's name. I'm also looking for George's brother, Thomas Pernell POSTELL, so if either Thomas or George is your George's father's name, we might have something in common.