It would probably kill my father the most. He'd probably realize that all of his nudie magazines and porno videos that weren't actually hidden well enough during my childhood may have actually had an effect on me. Not to mention that he used to frame centerfolds and post them in the garage and the bathroom and the closets. I grew up thinking that was normal. Until people came over and were usually appalled by it.
Oh well, now that he has obviously "re-discovered Jesus," I think all that's long gone. To him, at least.
He has cancer and only has a year to live.