If parents have joint custody do they have to agree about therapy for the child?

If the parents agree to it and you get accepted by the home study, yes.

You petition the court for shared custody. The details on how it will work has to be made by both parents and their lawyers. If they can not agree, the court will decide so it better you agree on who will have the child what day etc.

Yes, as long as the parent giving consent has legal custody of the child in question. In cases where parents have joint custody over a child both parents would have to agree to the change.

If both parents have joint legal custody, both parents must agree on the child going to boarding school. If one parent made the decision with out the input of the other, this would break the custody agreement.

If they have joint custody they will need to take the matter to court. However, at the same time the parent who is preventing the therapy from happening should realize that a judge is likely to change the custody order if the parents do not get along well enough to agree on important matters that concern the child's health and welfare. The parent who is trying to arrange therapy, if it is warranted, should request sole legal custody so that squabbling with the other parent will not delay needed services for the child.If they have joint custody they will need to take the matter to court. However, at the same time the parent who is preventing the therapy from happening should realize that a judge is likely to change the custody order if the parents do not get along well enough to agree on important matters that concern the child's health and welfare. The parent who is trying to arrange therapy, if it is warranted, should request sole legal custody so that squabbling with the other parent will not delay needed services for the child.If they have joint custody they will need to take the matter to court. However, at the same time the parent who is preventing the therapy from happening should realize that a judge is likely to change the custody order if the parents do not get along well enough to agree on important matters that concern the child's health and welfare. The parent who is trying to arrange therapy, if it is warranted, should request sole legal custody so that squabbling with the other parent will not delay needed services for the child.If they have joint custody they will need to take the matter to court. However, at the same time the parent who is preventing the therapy from happening should realize that a judge is likely to change the custody order if the parents do not get along well enough to agree on important matters that concern the child's health and welfare. The parent who is trying to arrange therapy, if it is warranted, should request sole legal custody so that squabbling with the other parent will not delay needed services for the child.