"A man and a boy"
Translation:Een man en een jongen
Wrong, the vowel in 'een' is pronounced like a schwa [ə], so the pronunciation is [ən]. The spelling here is kinda misleading because 'ee' usually represents the [eː] sound.
In Dutch, while distinguishing 'one' from 'a', we add diacritics, so one becomes 'één', which is pronounced regularly like [eːn].
'En' is indeed pronounced like the letter 'N' [ɛn].