Louise Cash Oddenino's maternal grandfather, Martin Armentrout, was originally from Rockingham County, Virginia but lived much of his adult life in Madison County, Virginia. He ran a sawmill, did carpentry work and built houses. Family stories recall him as a very hard worker who was missing a finger or two as a result of his work in the sawmill. Martin was a member of the Lutheran Church and his farm adjoined the Cash farm at Twyman's Mill. He was ill before his death and was at University Hospital in Charlottesville before being brought home where he died.
Rosa Armentrout was only five years old when he died.
Martin Armentrout's first wife was Annie Dowell who predeceased him. Martin later married Elizabeth Cook, mother of Rosa Armentrout. Martin's older children by Annie Dowell assumed much of the responsibility for raising Alice, Rosa, John and Ethel Armentrout after Martin's death as Elizabeth's health deteriorated. Rosa had a close relationship with her brother John who tragically died at age 19 from a flu epidemic. Ethel was adopted by Payton Armentrout, her half-brother, while Alice, Rosa and John stayed in the family home being raised by other siblings.