1A house or dwelling; a building where people live, or one's own home.
来月、新しい家に引っ越します。
I'm moving to a new house next month.
雨がひどいので、今日は家にいます。
It's raining hard, so I'm staying home today.
その家は木でできた古い建物だ。
That house is an old wooden building.
家に着いたらすぐ手を洗いなさい。
Wash your hands as soon as you get home.
2A family or household; the group of people who live together.
家のために毎日一生懸命働いている。
He works hard every day for his family.
彼女は五人家族で、末っ子だ。
She has a family of five and is the youngest child.
家を守るのは大変なことだ。
Taking care of the household is a difficult task.
3A family lineage or clan; used as "〜家" to refer to a specific family line (e.g. the Tokugawa family).
徳川家は江戸幕府を開いた一族である。
The Tokugawa family was the clan that founded the Edo shogunate.
彼は代々続く医者の家に生まれた。
He was born into a family of doctors spanning generations.