Parents of Moms

My parents were in a horrible motorcyle crash in June of 2009. My dad's brain stem was severed. He could walk with a walker somewhat in the beginner but now can't at all and is confined to a wheelchair in a nursing home. In addition to extreme memory loss, he has Alzheimer's Disease. My mother suffered slight brain damage and lives in an assisted care nursing facility. She now has the onset of Alzheimer's Disease. They are both, in my opinion, still very young - ages 72 and 67 respectively. I am their medical guardian. At age 47, I never thought this would happen to me so young in life. I miss having my regular parents' personalities and my dad's ability to walk normally tremendously. I don't know for sure if he even knows me many times when I visit him. My mother repeats herself often in her several voicemails to me each day. Things will never be the same and I haven't learned to accept this yet. I'd like to know if there are others out there in the same situation.