Sounds like things are progressing beautifully, FL. Even if he and your mom do stay in to try to change things at least you know you won't have to deal with shunning from them. I'm thinking that once he looks at some of your research he will be hard pressed to stomach much more time spent at the KH.
Goldminer, maybe you father's experiences as a MS will finally push him out. Nothing like being a congregation gofer.