Tell me if my father is deranged?

This is the evidence I have: 1) My mother told me when I was very young, my father tried to follow us with a knife in his hand. She locked me and herself in a room for a day till things died down. 2) My father's sister, before she lost her mental stature (due to a brain disease) had told my mother to not think before calling the police incase he does something bad 3) when he's happy he treats us nicely but when he's angry which happens quite often over very silly things, he abuses me, my mother, my mother's side of family, etc etc 4) yes there are very frequent mood swings. for instance: Today I was not in a good mood. He came in my room and asked me to phone the local restaurant to order him food. I told him please do it yourself I am tired. He said please do it, I said no. Then he abused me, attacked me, teased me, abused my mother, etc etc Btw the reason why I didnt want to order him food is because he doesnt eat the food at home. My mother literally makes the best food, people have told her to start her own restaurant. but whenever my mother gives my dad food he throws it all away in the dustbin without tasting it and makes sure that she is watching him do it. He is diabetic and has hypertension too, he walks everyday in park but he doesnt eat the food made at home. He wastes a lot of money by ordering food from outside everyday. 5) Years back he had slapped his junior over a tiff in a company and he refused to apologize for it so he got fired. He hasn't worked since then. he sits at home which is literally torturous for us. an empty mind is a scary mind. we live on some investments he has made which are enough to go by. 6) he hates my mother and has asked her to leave our house a couple of times. I know he likes me though. he gives me money sometimes to run the basic errands of the house. also gives my mother money for household work but gives me more, which makes my mother jealous. 7) One time I was playing outside, he called me up and told me to come home immediately. I came home and saw my mother beaten up with a broom. I took up the broom and looked at him and said what did you do to my mother? He said I have no power and came to me and hit me, pulled my hair and threw me away while my mother watched. my mother is very helpless. I was so upset and depressed over this that I missed my periods and had frequent episodes of low blood pressure and crying. When the tension died down my stupid parents didnt even realize why all of this was happening to me. 8) He has disconnected from all relatives. he has only one friend whom he meets once in a while. he doesnt call or text anyone. he's active on social media though. When relatives try to contact him he avoids them. 9) He emotionally blackmails us: Sometimes when he is very angry (over very absurd stuff like the telephone ringing a lot, or us not listening to his demands) he doesn't eat food. So he sleeps all day. his blood sugar goes down and he falls unconscious. my mother hand feeds him drops of glucose. she goes hell crazy over it. Because of all this, I have been depressed over a long period of time. I have frequent suicidal thoughts, and thoughts of wanting to burn the house down, but I know its unethical so I dont really do it. I self harm by pinching my face. It feels therapeutic. I also have a supportive boyfriend, and I keep in touch with distant relatives. Both tell me to move away by getting good grades in GMAT. Thankfully there is no major issues over finance. he provides me with money from time to time for my studies. Now such kind of abuse is pretty common where I live but not many people stand up to it, not even me. My mother and I are afraid that if we stand up no one will believe us because my father ACTS INNOCENT AND GOOD infront of everyone else and shows how kind he is which is so surprising! what should I do apart from calling the police? my mother doesnt let me do it.

/r/psych Thread