Unless a mother royally screws up a father should not be able to fight the mom for full custody. The justice system is screwed up and unfortunately a good mother goes unnoticed and often ends up losing custody of her child to a pos dad and his f'd up wife who doesn't have her son.
Bottom line NO GOOD MOTHER SHOULD LOSE CUSTODY UNLESS SHE ROYALLY SCREWS UP.
I said a good mom meaning one who takes care of her kids not a useless pos mom who abuses her kids. Good parents should be able to come to an agreement and put bad blood hatered aside for the kids. Pos moms deserve no custody, unfortunately a good mom is often over looked.