After a long vowel, a diphthong, or an unstressed -el/-en/-er ending, add -tje.
Every Dutch diminutive is a het-word and forms its plural with -s (zustertjes).
The diminutive (verkleinwoord) of zuster is "het zustertje". After a long vowel, a diphthong, or an unstressed -el/-en/-er ending, add -tje.
Het. Every Dutch diminutive is a het-word, so it is het zustertje even though zuster takes de.
Diminutives always add -s, so the plural is zustertjes.
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