I'm so sorry to be reading this Steve. Believe it or not, those bastards are not the only ones who think beating up an elderly man is acceptable. When I was in middle school my house was burglarized. My grandparents and my aunt went into the house in the middle of it, thought the car out in the driveway belonged to a friend or someone. They went in the house and they saw my gpa who at the time was near 90 and started beating him. My aunt froze in fear, and it wasn't till my gma told them hold old he really was that they actually stopped. Send him to the hospital for a few days, they took a bunch of stuff from the house, and were never caught.
I really hope your family makes a full recovery. I really don't know what else to say. Sometimes life just isn't fair.