In most states the court must consider what is in the best interests of the child when making custody decisions.

It is considered to be in the best interests of the child to have a good relationship with each parent. It is often the case that judges will allow a child to move from one parent to the other when the one parent has had a lot of time with the child and might be a good thing for the child to spend time with the other parent.

It is not considered in the best interests of the child to be with a parent who drinks too much. If he really is a heavy drinker, then the court would not want to change to order to give you more time with him. In fact, if he really is a hearvy drinker, the court might curtail his visitation, and make the custody no longer joint, but give it to your mother. However, if he only drinks a little bit, and would tell the court that he would stop if he got physical custody, the court might order a change.

Usually your father would have to file a petition to modify custody with the court, and your mother would file a response saying whether she agreed or disagreed. If she did not agree a hearing would take place. First he would tell the judge why the custody order should be changed, and then she would tell the judge why it should not be changed. You might or might not be allowed to talk to the judge, probably in chambers.

You should talk to both of your parents about what you dislike about the present situation and what changes you would like to see. Perhaps they can work together to make things more comfortable for you without going to court.