c7.1. In general, use person's full name on first reference, last name
thereafter. However, when two people with the same last name are mentioned
in the same article (for instance, husband and wife or two brothers), use
first names on second references. When writing about children (age 0 to
12) use first name on second reference. If the person is middle-school-
or high-school-age, then the use of first or last name on second reference
needs to be determined by the context of the article.