Does anyone know any home remedies to relieve ankle arthritis?

My grandmother has bad arthritis in her ankle. It hurts me to see her do her best to walk on that sore, swollen ankle everyday. I really want to help her. I know I can't fix the problem, but I was hoping that maybe someone would know a way to ease the pain and prevent some of the swelling. I would really appreciate it if someone could lend me some advice. Thanks.