My 80 year old mother-in-law has been taking Valium for at least 30 years. She pops a pill or two whenever she feels the situiation may cause her stress. My wife and I argue about this. I think she is abusing the drug and has become dependent. She has bottles of Valium hidden around her house and is always taking them. She has many of the symptoms of abuse and I feel her failing medical condition and deteriorating mental state is due primarily to this abuse. My wife says she is OK. How can I help her? My wife is the sole care provider for her Mom who is incredibly difficult to deal with...