My deepest sympathies to you and your family. My grandfather suffered from Alzheimer's as well, and he battled it for the last 8+ years of his life. In the beginning, it was just mild forgetfulness, which rapidly got worse. It led to a loss of recognition of just about everybody, and eventually everything. Earlier on, he would have some lucid moments who he would seemingly out of nowhere remember who I was, and ask me how I was doing, and tell me a story from my childhood, but those eventually stopped. He lost speech and finer motor coordination. At the end, my aunt couldn't even feed him anymore. He just stopped swallowing, almost like his body just didn't remember how to do it anymore. It's a cruel, cruel disease, and the only bright spot for him, you, and your family is that you no longer need to suffer through it.