Family words come in tidy pairs — learn each with its article:

Male	Female	English
der Vater	die Mutter	father / mother
der Bruder	die Schwester	brother / sister
der Sohn	die Tochter	son / daughter
der Großvater — Opa	die Großmutter — Oma	grandfather / grandmother
der Onkel	die Tante	uncle / aunt
der Cousin	die Cousine	cousin
der Mann	die Frau	husband / wife

Mann and Frau also simply mean man and woman: mein Mann is my husband, meine Frau my wife. At home, parents are Mama and Papa, and grandparents Oma and Opa.

The possessive follows the article, as always: mein Vater, meine Mutter.