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.
A viewing (also called a wake) may be brief and take place immediately before the funeral service, or may last for up to three days before the service. A visitation can take place any time, before or after the funeral service or disposition, and can last for hours or days. The body is on display in a casket.