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.
This parent is often referred to as the custodial parent. When one parent has sole legal custody, the non-custodial parent is granted visitation rights so that he can spend time with his children. Visitation rights, however, do not give the non-custodial parent the right to remove the child from the custodial parent.