It would narrow the playing field a bit if you could include some dates, or approximate dates, on some of the people in your query.
Do you know when and where your grandmother was born? Or when some of her children were born, and where?
As unusual as it may seem there are 4 named Hobart Marsh on the SSDI (Soc Sec Dth Idx). You did say they were from VA, is this a match?
Marsh, Hobart, b 16 oct 1911, d Mary 1978; last residence Indianapolis, Marion Co, IN; SS card issued in VA.