What is wrong with my father?

My father has 1 sister 2 brothers (3 including him). He is the oldest among the family..My grandparents died many years ago, since he is the eldest brother, he takes care of his siblings..Good right? NO. Because he does it too much, TOO much, he forgets that he has his own wife and two childrens to feed! And before you think that I am a brat, let me tell you- My father has 27 lakhs of loan in the bank (There also more but I don't know how much) because of his siblings. His younger brother is doesn't work (Too lazy to work) and my father takes care of him and his wife and his children, even when he struggles to take care of us! He takes out loans because his sister (My so called fuppi) needs money for business..They have a freaking business and my dad has job but still they have the audacity to take money from my father. When my mother's tells him that he's doing too much, he gets angry, shouts and leaves the home..Every friday he goes to his brothers and sisters home, everytime he spends money on them when he is clearly the needy, the financial state of my father is decreasing because of them, moreover he doesn't spend any time with us, His family...But today, he crossed the limit, my fuppi's husband said he will move to countryside since he has his own house there, and he wants to sell his property because he won't be here to take care of it...My father decides that he will buy this property..Guess what? All the property doesn't cost more than 6 or 7 lakhs..My father is paying 12 lakhs! He is taking loan to buy this property! Can you believe? When my mother said to father that he is paying way to much he says- 'So what? I will give my sister my money, so what if she takes more money? Let my sister take all the money, I don't care' Thats what my father said.. I am speechless...My mother cried, because she knows how much my father is struggling to maintain taking care of us and his siblings..He had been sick for the past few months, (There's something wrong with his backbone) He is can't see anything in one eye..He can't do normal things properly because he's getting more sick and sick..The doctor told him to stay at bedrest for 3 months but still he goes to office everyday because..He has a whole family to feed..Specially his siblings..He isn't a superman, he is also a man..He also needs someone to rely on..