Oompa:
I was aware of the changes, the contradictions, etc... in the Org. I always attributed this to man being imperfect. We were all just trying to get to the same place and hopefully get there at the same time. The brotherhood was a comfort. The emphasis on moral cleanness was a comfort. Etc....
It was after I became an elder and saw first hand that the teaching and the care of the congregation was not based on love and Christianity, but rather on a set of corporate
directives, that I truely began to have misgivings. When I became convinced that in fact I was following men and man made rules and doctrines and had to subordinate
the truth--- not just thoughts, doubts, etc--- but THE TRUTH!-- to their edicts and directives, then I knew I had to investigate.
To me it was not enough to say that we don't teach hell fire, or a Trinity, or that God's name is Jehovah---- Jews do likewise. And they haven't changed for 3500 years. So,
is Judaism the true religion?
The mediatorship of Christ only for the anointed: this was also a teaching of the WTS that resonated like a bold faced lie. And guess what? The majority of JW's either do not know that is the offical doctrine, or just dismiss it. I know that all the young people in my pioneer class had no clue that JesusChrist was not their mediator. Some were stunned to learn this and hear it for the first time from a CO, a direct rep. from the GB.
It may be too late for your Dad since he has invested so much of his life and faith in this religion. It is definitely difficult to reconcile being a true beleiver with the fact that you were actually a sucker. It hurts. I know, it hurt me like hell.
JW Facts put up a great post. I hope you find the info you need. Be prepared for it not being enough to convince your Dad that the Org. is built on a lie. It's built on shifting sand, that's why it changes so often. It has no true foundation.
All the best.