Traditionally, there has been the view that a child, given that their parents are not together, should belong with their mother. This made it difficult for fathers to have the desired amount of time with their children.
The Courts use best interest factors to in determining how to decide decision making and parenting time for children. In recent years Arizona has altered what is viewed as in the best interest of a child to include that it is in a child's best interest for them to spend time with both parents. This means that it has become more favorable for parents to share joint decision making and have closer to equal parenting time.
There are still many other factors that determine how decision making and parenting time are split up between the parents. In moving forward in a child custody issue one should consult an attorney to help determine the possible actions and consequences that could arise in your case.