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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• in tact vs intact
• buttox vs buttocks
• stood vs stayed
• writting vs writing
• acapella vs a capella vs a cappella
• tooken vs took vs taken
• submittal vs submission
• greatful vs grateful
• tripple vs triple
• absorbtion vs absorption