Never felt close to my father

My family was a happy family till i was in 16. My parents,me n my sister used to live together as a family with all the fun n tours n everything that a family does. But then , a woman came to my father's life and he started meeting n was in relation with her . Slowly everyone at home and office came to know abt it. My mother became so low and depressed , he didnt wanted to listen to anyone . He carried on with that woman . That woman also tried to come to my house but my mom abused and didnt allow. My father is very much proud that he has all the money and position , but he doesnt know that the greatest happiness one can get is with family . B'cz of him my sister had to consult psychiatrist. And she behaved abnormally and also we admitted her in a hospital for treatment . But god has made her fine slowly. My father has been in relation with that lady as well as he sends her a lot of money , which we came to know. He never accepts and says , i do it all for only my family and no one else. This has been going on from last 13 years . But 4 years back we shifted to a new city . So he doesnt visit that lady a lot as it is quite distant place. But we came to know that he still sends money. My mom n sis doesnt have money but have all the love for me. My father always gave me money anyhow but i didnt really love me by heart n also cheated my mom n still cheating. He never motivates me to do something good in life but always taunts me , however my mom n sister always motivate me . I feel very bad and low abt it and recently i developed shortage of breathe due to anxiety disorder . Please let me know friends how shall i overcome this situation .