Aslamlukum !
First i would like to thank you for helping All Muslim Brother and Sisters in trouble.
i am 23 year old undergradute student.
Recently i found proofs of My father illegal relation with another women other than my mother,
The photographs and videos proves that he commited adultry to a woman.
Also i found a bottle of Vodka and Wine in his cupboard,
I came to know all this when i was working in his office in his absense, and i sneaked into his cupboard without his permission, Did i commited a sin?
Since now, I respect my father, as he always took care of all his four children, and my mother.
This is the only sin i came to know abt him.
I ran away from my home to a freind without telling anyone why, because i dont want others to knw, neither i can lie to my mother, i am not talking to anyone as they will ask the reasons.
What am i supposed to do ?
A brother needs your help

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His Slave and Messenger.

Opening the cupboard of your father without his permission is prohibited and it is one sort of spying and tracking people's faults. Allaah The Almighty forbade spying in the Quran Saying (what means): {And do not spy.}[Quran 49:12] The Prophet, sallallaahu ‘alayhi wa sallam, also forbade spying. It was narrated on the authority of Abu Hurayrah that the Prophet, sallallaahu ‘alayhi wa sallam, said: "Do not spy." [Al-Bukhari and Muslim] This prohibition is more confirmed with one's father. Thus, you have to repent to Allaah sincerely of that sin. For further information about the conditions of repentance, see Fatwa 86527.

On the other hand, it is not permissible for you to tell anybody about the photos, and you must conceal what you found out about your father. Moreover, it was a mistake that you left the house and your family because you should have been close to your father and tried your best to reform him indirectly by things like playing a cassette player in his presence to let him hear touching admonitions which could deter him from committing sins.

Finally, you should supplicate Allaah to guide him to repentance and to the straight path. For further information, see Fataawa 101091 and 19274.

Allaah Knows best.