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. A noncustodial parent usually is allowed visitation without anyone else being present to watch over the child. Sometimes, however, visitation may be supervised, such as when the parent has a history of violent behavior or alcohol or drug abuse, for example. This is when an adult (not the custodial parent) is present during visitation.