學習筆記：
father：爸爸
例句：His father was a professor of medieval studies.
他的父親是研究中世紀歷史的教授。
mother：媽媽
例句：He recognized his mother's handwriting on the envelope.
他認出信封上他母親的手記。
brother：哥哥
例句：Must your brother tag along with us everywhere we go?
你兄弟幹嗎總緊跟著我們?
sister：姐姐
例句：She was intriguing with her sister against her mother.
她和妹妹串通搗鬼和母親作對。
baby：嬰兒
例句：I must mind the baby while Mum goes to the shops.
媽媽去買東西時我必須照看這嬰兒。
