Child custody before divorce

My wife did not listen to me and has gone to attend the function of her relative who has has had physical confrontation with me. Inspite of me warning her that if she goes to that function who has disrespected me and had physical confrontation with me, I would not let her in my house again she has still proceeded to attend the function. Now I do not wish to let her back in my house but she has my son who is less than an year old, I want to have custody of my child as her parents or relatives never cared for my child and her own father has not even visited once since the child's birth to look at him or care for him I believe they are not the right persons my child will be taken care off. At my home my parents take care of my child with love and affection also at my home we have all the necessities to take care of a child where as at her home they lack basic necessities which will eventually harm the health and upbringing of my lovely child. I love my child and do not wish to leave him with my wife and her parents place as they will not be able to take care of him and provide basic necessities to my child I need help in getting custody of my child immediately