(((Valis))).........I'm so sorry to hear this happened. I know how frustrating it can be.
I've long thought though, that the main problem with making JWs see the problem with the religion is not because of 5 meetings a week or even the pedophile problem. The real problem is that as long a each Jehovah's Witness believes that the Governing Body were appointed by God in 1919 to "watch over the flock", then absolutely everything bad that goes on in the congregation can be explained away. That's the bottom line, as long as they believe these men have a direct link to God.
If you can show your father that Jeruselem was NOT destroyed in 607 BCE but in 586 BCE, you'll see the wheels start turning in his head (I'm talking from experience here). Because without that date, that means Jesus didn't "Return" in 1914, which means God never appointed the "Faithful & Discreet Slave" in 1919 CE. Without that authority built on sand, then the whole religion is brought into question. Don't forget: this is what preceeded Ray Franz from being forced out: he came to the discovery about 607BCE and Freddie Franz apparently went off the deep end because he realized what a threat it was to their authority.
So forget trying to talk to your dad about 5 meetings a week and "apostates", etc.........If you can just present this one simple fact it could start a chain reaction.