sister in laws or sisters in law

Your spouse’s female siblings are not your sister-in-laws, but your sisters-in-law. The same pattern applies to brothers-in-law, fathers-in-law, and mothers-in-law.

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• absorbtion vs absorption
• appauled vs appalled
• notate vs note
• stood vs stayed
• greatful vs grateful
• blindsighted vs blindsided
• swam vs swum
• dateline vs deadline
• warmongerer vs warmonger
• epic vs epoch