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 (relatietjes).
The diminutive (verkleinwoord) of relatie is "het relatietje". 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 relatietje even though relatie takes de.
Diminutives always add -s, so the plural is relatietjes.
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