A strange question but I think a valid one. My aged father is consumed with Catholic guilt as he's getting nearer to the end of his days. He talks constantly about the end of the world and predictions of The Blessed Virgin and how we're all sinners. I'm a practicing Catholic but I'm no way as obsessed as he is. He drives my siblings mad to the point where they either lose their temper at him, or just not talk to him.
Is this a dementia thing?