Child custody advice

I hope someone here has some knowledge into these things and can give some advice.  I'm sorry this is so long....

I am concerned and sad for my nephew, who is being denied visitation unless supervised.  My nephew is 19 years old.  He met the mother of his child, and she became pregnant right off the bat it seemed.  Before the baby was born, they married.  When the baby, which was a little girl, was 3 months old, they called it quits and she left.  A couple weeks after her leaving he called her and said he would like to come get the baby and take her to his mom's so they could see her and spend some time with her as well as spend time with her himself also, and he was told no.  She did not want him taking the baby anywhere.  She said he could visit her but not take her.  So he got mad about it and didn't go to see her.  Well this continued.  She insisted she would not let him take her anywhere.  He was stubborn and said well if I cannot come get her then fine and he didn't go see her (which he should of) but we are talking about a teenager here, don't make the best decisions.  Fast forward, the baby was 8 months old, and he went and saw her.  At first, he was denied being able to even see her.  He was adamant he deserved to be able to see her.  He wasn't there to ask to take her anywhere, just SEE her and hold her.  So finally she brought her out and let him hold her.  Then she met him in town a few times and let him see and hold her. 

My sister (who is the baby's grandmother) and my mom (great-grandmother) and me (great aunt) have not seen this baby girl since she was 3 months old.  We would LOVE to see her.  So my nephew called her and said look I would like to bring the baby to my mom's and let the family see her.  She told him no.  She said she doesn't remember you or your family and I don't want her over there.  Ya'll are strangers to her.  He said we are not strangers.   We are her family who would know her better if you would allow me to bring her to visit them and allow me to spend more one on one time with her.  She said no, not happening. 

So my sister emailed the baby's mother's grandmother and said look all we want is to have a visit with the child here at my house for a few hours.  If she cannot do that then we will have to take this to court.  So the mom calls my nephew back and says okay you can get her from 12-4 pm tomorrow.  He says okay.  Everyone is so excited.  Me and my mom had made plans to go see her.  Then later she calls him back and says no she changed her mind.  The baby doesn't know us she said and doesn't know him well enough to go over there.  It would be cruel for her.  She went further to say he would have to visit her in her presence or nothing.  She said you have not been a part of her life for 5 months so now you can't be a part of her life.  You just can't walk in and decide you want to see her.  It doesn't work that way. 

Well correct me if I'm wrong, but I don't think a judge is going to deny a father the chance to know his daughter and bond with her and be a part of her life and her be a part of all our lives.  How is he going to bond if he can't take her anywhere?  We are all so let down. 

She has also put pics on her facebook of her with her new boyfriend and he is holding the baby and it says "our lil family."  It is like my nephew was replaced and is wanted out the picture totally.  Her new guy we have been told sells drugs, has been arrested for drugs and is being watched by the law for drugs.  So he is not a role model by any means.  She leaves the baby with others and goes out with him.  How can he be good for this child?