他的 + 妻子
妻子 (qīzi) is a noun meaning 'wife.' It is a standard and slightly formal way to refer to one's spouse. In everyday speech, 老婆 (lǎopo) is more colloquial, while 妻子 is preferred in written and formal contexts.
他的妻子是一位医生。
Tā de qīzi shì yī wèi yīshēng.
His wife is a doctor.
妻子每天早上给他准备早餐。
Qīzi měitiān zǎoshang gěi tā zhǔnbèi zǎocān.
His wife prepares breakfast for him every morning.
他和妻子结婚已经十年了。
Tā hé qīzi jiéhūn yǐjīng shí nián le.
He and his wife have been married for ten years.