Tammie,
Welcome and sorry your Dad has our problem but, there are many caring and answering people on this forum. Mayo is certainly a well respected hospital so that is a plus. I had to google parotid cancer (salivary glands I discovered). 11 years later is unlikely these two are related so treating bladder will certainly be different. I am surprised chemo and bladder are recommended before a Pet Scan (I am not a doctor) but, I assume other diagnostic tests confirmed the bladder cancer such as a cystoscope, CT Scan and a TURB (a surgery to stage and confirm via pathology)? If your Dad's diagnosis is stage 2 or higher the protocol is removal. However removal isn't the end of things,. There are many survivors of many years on this board and I am sure some will chime in. Your Dad is fortunate he has a daughter that cares and it is certainly good that you are there to help, ask questions and encourage. Please check this web site also as many additional topics and issues are addressed here.