The document defines and provides additional terms for various family members in English. It discusses nuclear family members like mother, father, children, son, daughter, siblings, brother and sister. It also covers extended family such as grandparents, aunts/uncles, cousins, nieces/nephews. Terms related to marriage and partnerships are explained like husband, wife, partner, girlfriend/boyfriend. Related terms involving step and half relatives as well as in-laws are also defined. The document provides a comprehensive overview of vocabulary for describing family relationships in English.