Translation:De har et barn.
Why is barn 'et' and sandwich 'en'?
Best answer: Because it is
Danish has the two grammatical genders, common and neuter (n-words and t-words). This post should help you out more
what is the difference of et and en?
en is used for nouns with common gender (en bil, en mand, en kvinde)
et is used for nouns with neuter gender (et hus, et æble, et barn)
For more information see this post
I thought 'en' was 'the' and 'en' was 'a' or 'an'.