We were surprised to find so many volunteer organizations that were able to provide assistance.  We checked with a local church and found they had a large outreach program (we also recommend contacting the local city or town hall).  They provided such assistance as delivering meals, fixing things around the house, running errands like picking up groceries or medications, chauffeuring to appointments, as well as friendly visits to the home, nursing home or hospital.  The local church also had volunteers who were willing to give respite care, which provides a break for your other caregiving parent.