A dyad (from Greek dýo, "two") in sociology mostly refers to parents and friends, occasionally to twins. Sociology (from Latin: socius "companion" and the suffix -ology "the study of" from Greek λόγος lógos "knowledge" A parent is a Father or Mother; one who sires or gives Twins are Offspring resulting from the same Pregnancy, either of the same or opposite Sex.
Dyadic friendships refer to the most immediate and concrete level of peer interaction, which is expanded to include new forms of relationships in adolescence - most notably, romantic and sexual relationships. Friendship is a term used to denote co-operative and supportive behavior between two or more beings Interaction is a kind of action that occurs as two or more objects have an Effect upon one another Already Ferdinand Tönnies treated it as a special pattern of gemeinschaft, 1887, as community of spirit. Ferdinand Tönnies ( July 26, 1855, near Oldenswort ( Eiderstedt, North Frisia) - April 9, 1936, Kiel Gemeinschaft ( gəˈma͡ɪnʃaft and Gesellschaft are sociological categories introduced by the German sociologist Ferdinand Tönnies for two
See as well Triad (sociology). In Sociology a triad is a group of three people It is one of the simplest human groups that can be studied and is mostly looked at by Microsociology.