My brother- in- law is a science graduate and MBA , is 29+ yr old. 1 month ago he was normal. But recently we found some mental disorder on him. He is fearing his neighbour or relative to attend any ceremony cause they may kill him or families  , he judging people with there face, eyes, eyebrows etc. He thinks that all doctors are evil like they are demons worshipers, he explains it from some Greek or Roman mythology. Few months ago a snake entered into house and I ( Jamai of his family) help to get out the snake from house and didn't kill it. He fears snake, he is now blaming me from some mythology that I am a demon . I love my wife and calls her "SONA" means " gold" , he is saying why he calls like that , he is trying to kill my sister, he is doing drama to kill my sister as according to his mythology or anything else. He now a days matching every thing with numbers like 23rd date of a month and keeping avoid to get outside. He alone reads book from internet , watching  movies.