mother-in-law apartment
US /ˈmʌð.ər.ɪn.lɔː ˌəˈpɑːrt.mənt/
UK /ˈmʌð.ər.ɪn.lɔː ˌəˈpɑːrt.mənt/

1.
義母アパート, 付属アパート
a separate living space within a single-family home, typically designed for an elderly parent or other family member, often with its own entrance, kitchen, and bathroom
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They added a mother-in-law apartment to their house for her aging parents.
彼らは高齢の両親のために、家に義母アパートを追加した。
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A mother-in-law apartment can provide privacy and independence for extended family members.
義母アパートは、大家族のメンバーにプライバシーと独立性を提供できる。