The Eustachian tube connects the throat and the middle ear (the site of a typical  ear infection ) and allows air to travel between them and equalize the pressures. When the Eustachian tube is temporarily pinched off, pressure can build up in the middle ear.
Visitation is a matter of state law, but generally speaking, every state allows parents to exercise a reasonable amount of visitation with their children, which generally means enough time to establish and maintain a meaningful relationship.
Supervised visitation. Supervised visitation allows parents in high conflict or high risk situations access to their children in a safe and supervised environment. The noncustodial parent has access to the child only when supervised by another adult. Supervised visitation is used to protect children from potentially dangerous situations while allowing parental access and providing support for the parent child relationship.