Whew, since your story is pretty much my own in a nut shell (3 yrs of OW, dad's illness, living a life treating OW as his W,etc.), I'm sure getting the benefit from the insightful posts on your thread & getting good direction.
It is hard to watch when the consequences hit home for them.
I still wonder how they could have watched the effect on us so seemingly easily. The truth is they did.