If a pronoun is used to address or refer to one or more personsin the following categories the pronouns must be the plural form:(i) a female relative through marriage of a male ego (except wifeof ego); (ii) the wife of a male cross-cousin of a male ego; (iii)husband's brother; and (iv) the husband of a female cross-cousin ofa female ego. If a pronoun is used to address or refer to certainmale affines of a male ego the pronoun must be dual.