Which family relationship is described by 'Alberto gets along with his mother-in-law'?

• A. Mother-in-law
• B. Sister-in-law
• C. Daughter
• D. Aunt

Answer: (A)

The statement points to a relative by marriage—the mother of his spouse. A mother-in-law is the mother of one’s husband or wife, so for Alberto, the person described as his mother-in-law is the mother of his wife. In contrast, a sister-in-law would be his wife's sister or his brother's wife, a daughter would be his own child, and an aunt would be the sister of a parent (or spouse’s aunt in a different sense). So the described relationship is his mother-in-law.