Switching off the oxygen machine

Q: I have a question regarding Maut during old age. My dada is now 83 years old and has Alzheimer's he's bedridden and currently suffering from pneumonia, because of his infection he's on oxygen, he finds it difficult breathing without the oxygen, he is not on a ventilator, is it permissible Islamically to switch the oxygen off? Please advise.

Shaving the head

Q: There is much virtue for shaving one's head when on Umrah or Hajj. What is the virtue for shaving one's head when not performing Umrah or Hajj. i.e. did Nabi (Sallallahu Alayhi Wasallam) shave his head when not performing Umrah or Hajj?

Irregular bleeding

Q: Three months before I had a injection to not have pregnancy, but after that my periods stop for few weeks I had bleeding that was not periods one but I had been praying with putting clean pad in every namaz now I want to ask you that my action was acceptable which I have been praying and secondly after that bleeding stopped. Just few days little bit bleeding for some time a day and some time couple of days then it stops. So please guide me fully that shall I pray in these days or shall I wait for three days like haidh?

Zihaar

Q: Please explain the meaning of zihaar and if this has anything to do with talaaq. It is stated in the Quran that if a man wants his wife back then he should fast for two months or feed sixty poor people.

Talaaq in anger

Q: I like to ask a question about divorce that if a person doesn't know the proper rules of divorce. So in an extremely angry status he says but can't remember how many times, wife also didn't remember and when he calm down he said I didn't have intention to give you divorce at all. He did this already two times in different occasions each time he said he doesn't have any intention to give divorce or leave his wife at all because he loves her. His sister also have anger issues and she is on medication but he is alright but sometimes he becomes extremely angry and start saying things which in normal condition he doesn't want to say. Please explain me what the Shariah says about it?