You would need to get either an attorney, or the assistance of your state child welfare agency. The agency would investigate and determine if he was fit to have custody. If he were found to be unfit, it would then be up to the court to decide to whom custody should be transferred.
Just to say that someone is a alcoholic is very vague. You need proof to present in court that he is and that he is neglecting the child.
Unless he's abusive, an alcoholic, a repeat criminal, a drug addict, doesn't provide for his children or has a partner that is either of these - you can't. The father has the same every right to access the child as the mother.
Actually it all depends on the mother's status in the sense if she is capable to raise the child not a alcoholic or addict or mentally unstable under these circumstances father is given custody but if the mother is capable then usually mother gets the child these are the broad base lines and laws differ from place to place
Prepare your evidence and file for custody see link below
If the ex is living in the household where the child would be visiting - then the other parent could ask for "supervised" visitation. The court could also demand that the alcoholic NOT be present in the home when the child is there. Whatever happens, the child obviously does not need to be around an alcoholic. While you may not be able to get full custody due to this fact, you do have some control over how and when the ex sees the child if the alcoholic is around.
Sadly, many times a vile wreckless drug addict can get joint custody of a child if the courts are not aware of the drug problems. If the child is in danger, speak to an attorney to get the custody order changed.
She can't. She might be able to persuade a court to do so. The child support would, of course, cease (and in fact the father might be able to then claim child support from the mother).
They recently changed the laws of custody, No one parent has full custody UNLESS they see the other parent as unstable and unfit. If the parent you want to live with has been deemed unfit as a parent then it will have to be taken to court or you can contact certain child organizations to give you more details about how to leave your current home and return to the home of an "unfit parent" However if one parent obtained full custody of the child and the other parent was not deemed unfit as a parent, you may still live with them because of the recent change in custody laws, stating no one parent can have full or primary custody. (in other words, if your mom has full custody and your dad has none ((Also assuming the father hasn't been charged with being a drug addict, alcoholic, or financially unstable etc.)) you may live with the father)
It an issue that can be raised with the court in determining what affect if any this may be having on the child.
Go talk to a family lawyer and tell thim the situation. They will be able to tell you what you need to do. You need to do this right away, for the child's sake.
Actually it's Guardianship, and you would need to file a Child In Need of Care Motion.
It regards the issue of getting an emergency custody order for a child in need of care.