the words for people and family.
people
de vriendinthe friend (f) family (familie)
de moeder / mamathe mother / mum de vader / papathe father / dad learn the de/het with the word. people are usually "de" — but het kind and het meisje (‑je words are always het).
easiest way to remembermoeder / vader = a bit formal · mama / papa = everyday.