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The plural for for the compound noun sister-in-law is sisters-in-law.

The rule is that the 'sisters' become multiple, but the relationship 'in-law' does not become multiple, it is still the same relationship to a siblings spouse.

Note that you will hear people say, 'my in-laws'. This term is used when the 'in-laws' are relationships of varying combinations of sister, brother, father, mother-in-law and the abbreviated form is easier to say.

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