Masculine	Feminine	English
il padre	la madre	father / mother
il papà	la mamma	dad / mum
il fratello	la sorella	brother / sister
il nonno	la nonna	grandfather / grandmother
lo zio	la zia	uncle / aunt
il cugino	la cugina	cousin
il figlio	la figlia	son / daughter
il marito	la moglie	husband / wife

The masculine plural covers mixed groups: i fratelli is brothers or brothers and sisters; i nonni are grandparents; i figli are children (sons and daughters). Parents are i genitori — not i parenti, which means relatives.