Father’s right to see and visit his son if the child is in the custody of his divorced mother
Question

                My husband left me and our baby son because he said he came to this country to work not for family life.(basically, ive used u and have no need for u anymore). for 4 yrs he never once tried to see his son, at one point my son had a meningitis scare and i called him, he said he was coming but never did. i forced him to pay for our son through the csa as he was refusing too. in the 5th year, he divorced me ,went back home and got married to his first cousin.he is now back in the uk and wife is still back home. he got hold of my number about 6months ago and started harrassing me and talking to me like he was still my husband, he started following me around, saying he still wanted me back etc! i could not believe,that this man i thought was a good muslim was talking like this, he left us, he divorced me ,he got married again and yet somehow he said it was all my fault (even his 2nd marriage is my fault apparently), anyway,cut a long story short, because i spurned his advances and contacted the police to stop him,he is now dragging me through the courts for access to our son,out of feeling rejected. i know he is not interested in our son and is only doing this cos i spurned his advances, im really scared about going court ,as i will have to pay etc and i have a solicitor but i am so frightened about all this. my question is,wat does islam say about what he is doing,am i wrong in stopping him seeing his son,even though he beat the hell out his baby son and me,when we were married and for 5yrs (my son is 5yrs now marshallah) has shown no interest in his son? i dont know what to do,i dont want to do anything wrong islamically but want to do what is right for my son at the same time ,which is, no contact with his father ,as he is violent and has shown no interset in him ever and now is using him as a weapon to get to me. even though he has done all this,do i islamically have a right to try and stop him getting access,he is not morally or islamically even a good role model for his son.
Praise be to Allah.
    Undoubtedly what you mention about this man indicates that he 
    does not represent a good example to his son of good character and religious 
    commitment, and he is not qualified to have custody of the child and raise 
    him. But this does not mean that he does not have the right to see him and 
    check on him from time to time. Similarly, the son’s duty to honour him and 
    treat him kindly is not waived. 

    The fact that the father is falling short and negligent, or 
    he is an unjust wrongdoer, does not mean that the son should forsake him and 
    ignore him, or that we should encourage him to do that, because the father’s 
    rights are great, as are the mother’s rights. 

    The fuqaha’ stated that it is the father’s right to see his 
    child if the child is in the mother’s custody, and that he should not be 
    prevented from visiting him. But they differed as to the time frame within 
    which he should visit him. The Hanbalis referred the matter to custom 
    (al-‘urf), such as visiting him once a week. The fuqaha’ pointed out that 
    after divorce, the husband becomes a stranger or non-mahram to his ex-wife, 
    so attention must be paid to that. If he visits the child in his mother’s 
    house, he should not stay for too long, and it is essential that he should 
    not be alone with his ex-wife. She may prevent him from entering her house, 
    but she should bring the child out to see him.  

    If the child falls sick, the father should not be prevented 
    from visiting him. Thus each person should be given their due rights. 

    Al-Mawsoo’ah al-Fiqhiyyah 
    (17/317); al-Mughni (8/193). 

    You should try to understand this matter, and not strive to 
    separate the boy from his father, or fill the boy with resentment and 
    hatred. In addition to being haraam, this is also harmful to the child’s 
    psychology, character and behaviour. 

    If you are afraid that the child may be influenced by some of 
    his father’s bad attitudes, this may be remedied by raising him well and 
    directing him properly, without speaking ill of the father or distorting his 
    image in the child’s mind. 

    The point is that it is not permissible for you to deprive 
    the father of seeing his son and vice versa, rather you must allow him to 
    see him and visit him, either in your house, if you have a mahram with whom 
    you will feel safe if he enters your house, or outside the house. You can 
    agree on a suitable time frame, such as every week, every two weeks and so 
    on. You should also strive to raise your child well and bring him up with 
    good morals, so that he will have a good attitude towards his father and 
    others. Avoid turning the child against his father or making him hate him, 
    because that is haraam, as it is a call to sever ties of kinship. Allaah 
    says (interpretation of the meaning): 

    “Would you then, if you were given the authority, do 
    mischief in the land, and sever your ties of kinship? 

    23. Such are they whom Allaah has cursed, so that He has 
    made them deaf and blinded their sight”

    [Muhammad 47:22, 23]

    And the Prophet  (peace and blessings of Allaah be upon 
    him) said: “No one who severs ties of kinship will enter Paradise.” Narrated 
    by Muslim (4637). 

    It says in Fataawa al-Lajnah al-Daa’imah (21/205):  

    If the wife leaves the marital home or the couple becomes 
    separated by divorce, for example, and they have a child or children, it is 
    not permissible according to Islamic sharee’ah for one of them to prevent 
    the other from seeing or visiting their child. If the child is in the 
    mother’s custody, for example, it is not permissible for her to prevent his 
    father from seeing him and visiting him, because Allaah has enjoined 
    upholding ties of kinship, as He says (interpretation of the meaning): 

    “Worship Allaah and join none with Him (in worship); and 
    do good to parents, kinsfolk…”

    [al-Nisa’ 4:36]

    According to the hadeeth: “If anyone separates a mother and 
    her child, Allaah will separate him and his loved ones on the Day of 
    Resurrection.” 

    End quote. The hadeeth was narrated by al-Tirmidhi (1204) and 
    classed as saheeh by al-Albaani in Saheeh al-Tirmidhi. 

    Now that you know the shar’i ruling on this issue, beware of 
    resorting to the courts of man-made law to deny the father his right to see 
    and visit his son, although you do have the right to go to court to prevent 
    him from wronging and harming you, or taking your son away from you. 

    We ask Allaah to help you to raise him well and to help you 
    to do which is good, right and proper. 

    And Allaah knows best.