Visitation Rights For Biological Father

Hello, I was in a relationship with a girl for 8 years, we were not married. But she got married to some one else in the 2nd year of our relationship, while marrying, she lied to me about father's health and father didnt accept our relationship, hence she has no other choice than marrying some one, while she promised to get back to me after few years, I was stupid and naive to believe this. I was in 2nd sem of my engineering, she was a graduate by then. She is 1.5 years older than me. After her marriage, we were talking and she used to visit me, we did the deed and she was pregnant because of me. At that point, she fought for the divorce from her husband and got it a few years later. Meanwhile, she lied to me that her mother knows that it was my baby, mother is supportive of the child, she lied because, I didnt want to have a baby while im in college. She someone convinced me, later it came to light that mother didnt know anything, while i talked to the mother on a occasion and revealed her the truth. Later on, since mother of my gf didnt have a choice, she was supportive. The child is about 5 years now. Me and my gf had a fight and she has broken up with me, in these 5 years, i got to see the child for 5-6 times, because it was a secret that the child was my son. Now, i had visited my gf's house and i came to know that her father doesnt know anything about us and he is healthy. I feel that i've been taken advantage of at many things. But I seek visitation rights for the child now and my gf, the father of my gf and the brother of my gf's father are not letting me to spend quality time with my son, I asked for 2 hours in a week, they're not letting this happen, I dont know what to do. I'm not economically established to hire a lawyer and fight, all this law things are very new to me. How do i get to visit my son. Please help, Thank you.