There are a few exceptions like if a parent lives out of state with the children then the court might give the parent who lives in state with the children sole decision making. (divorcemag.com)
Also, whoever was designated the primary caretaker was given sole decision - making responsibilities. (illinoisdivorcelawyerblog.com)
It is also possible for one parent to have sole custody — which means sole decision - making authority — while the child splits his or her time between each parent's house. (mannlawyers.com)