“sisters-in-law.” But
possessives of
hyphenated compounds add an apostrophe and “S”
to the end of the compounded string the sisters-in-law’s gift (treated as a singular possessive although the compound is plural because of the position of the rst “s,”
which makes a plural “Self-starters’ rewards are great (plural possessive formation because the plurals and possessive ending are in the same place).
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