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.
Child visitation law governs the rights of non-custodial parents to spend time with their child. These cases are usually handled by state courts as part of broader family law proceedings dealing with issues such as divorce, separation, alimony, and child support and custody.