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.
Parental Visitation Rights FAQ. Child custody issues are never easy and visitation is often a primary concern of individuals going through a divorce. As an initial matter, it's important to know your state's child custody laws.