"Our children have a cat."
Translation:Unsere Kinder haben eine Katze.
in german, every plural noun is feminine, so you say die kinder even though the singular of it is das kind, so for kinder it is unsere not unser
Could you explain to me why it isn't einer please? I made the same mistake.
It is not dative. Here the children have a cat. Therefore the cat is the direct object, and thus the word is 'eine' because it takes on the accusative case.
Yes, but the plural of "Kinder" is "Kinder." The context of this sentence (feminine "unsere" + plural conjugation of "haben") differentiates the plurality of the word here.