COMPOUND ANTECEDENTS

Two or more antecedents connected by or or nor are frequently referred to by the plural when the singular should be used. Neither John nor James brought THEIR books, should read, Neither John nor James brought HIS books.

When a pronoun has two or more singular antecedents connected by or or nor, the pronoun must be in the singular number; but if one of the antecedents is plural, the pronoun must, also, be in the plural. Ex:Neither the Mormon nor his wives denied THEIR religion.

When a pronoun has two or more antecedents connected by and, the pronoun must be in the plural number. Ex: John and James brought THEIR books.