Family words come in neat masculine/feminine pairs:

Masculine	Feminine	English
le père	la mère	father / mother
le frère	la sœur	brother / sister
le fils	la fille	son / daughter
le grand-père	la grand-mère	grandfather / grandmother
l'oncle	la tante	uncle / aunt
le cousin	la cousine	cousin
le mari	la femme	husband / wife

• Fils is said “feess”: the l is silent and the s is sounded.
• La fille is also the girl, and la femme is also the woman — it sounds like “fam”.
• At home you'll hear papa, maman, papi, mamie. Marcos's family is Brazilian — they moved to France when he was about ten — so at their house Grandma is called Vovó, Portuguese for Grandma.

To introduce someone, say Voici… — Voici mon père. (This is my father.) Or, a little more formally, Je vous présente… — Je vous présente ma mère. (May I introduce my mother.)