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 guardian is someone who takes care of a child's needs. This typically includes such things as shelter, education, food and medical care. Guardians also usually manage the finances of the child. A guardianship is a legal relationship between a minor child and a guardian that gives the guardian certain rights and obligations regarding the child. A guardianship does not sever the legal relationship that exists between a child and his or her biological parents, however.