This dissertation investigates kinship address forms in Japanese and in Brazilian Portuguese, with applicability in Portuguese as a Second Language classes. Both in Japanese language and Portuguese language it is possible, for example, to use the word uncle to refer to a person who isn’t actually brother nor brother-in-law of either your parents. Still, the way of using this and other kinship words as address forms differ in these two languages. With data collected from Japanese and Brazilian comic books, the use of the following kinship words is analyzed: brother, father, grandfather, grandson, husband, son, uncle and its respective feminine forms. The analysis is based in concepts from Anthropology, Interculturalism and Pragmatics and it confirms that there are differences between Japanese and Brazilian use of kinship words. The results of this research show when, how and why each of these forms is chosen by the speaker to talk with a non-relative.