My father now believes in Yin and Yang, the God of five lines of gossip and so on.

According to the landlord's description, your father is obviously paranoid, and the direct reason should be the books he read. Your father's cultural level should not be high, so he is deeply influenced by books. From what you said above, your father's situation is not very optimistic. I suggest you take him to a psychological counseling institution for a systematic examination.

As for the answer on the first floor, the intention is good, but even if the old man fails in this situation, he will think that this is God testing him, and God is honing him, and he will not take the initiative to realize his absurd behavior now.

Therefore, it is suggested that the landlord take your father to check as soon as possible, and time cannot be delayed.

I call it the old man, which is also a kind of honorific title. No offense, but your father's condition is not optimistic. Have a check-up as soon as possible.