When ילדים is used, it can be interpreted as either "boys", "children of differing genders", or "children of unknown or unspecified gender". It's true that the grammatical gender of the word is male, but bare in mind that it there is no neuter in Hebrew and many times male is used for neuter or mixed. If I wanted to translate "their boys" I would go for הבנים שלהן.
I still don't see how translating with "boys" is a mistake. It may be not the best translation in the context, but definitely not a mistake. Especially because we were taught in previous lessons to translate ילד and ילדה as "boy" and "girl".
It can be a possible translation only if you know her and you know all her children are male. Otherwise ילדים is not gender specific. boys = בנים.
Then we do not know how to say boys and we should avoid it in all translations. Except there are other sentences that require us to translate it with "boys". When the course contains sentences like "They are sad and they are sad", which only makes sense in a context where I am physically pointing at the groups of men and women, it is unreasonable to say that there is not enough context to allow for a translation of "boys" in this sentence.
If it can be a possible translation, as you say, then it should not be considered wrong.
It is not a possible translation, it can turn out that the children are all boys, but it's not implied in the sentence.
My answer "Their children are having breakfast" was considered wrong. I think allowed translations are just too literal. I suppose Duolingo expected "Their children are eating breakfast", as in my answer "having" was marked as mistake.
Takes time to track down all of these. That's what the report button is for.
Yes indeed. I have reported the sentence of course. But, as I am not a native English speaker, I added my comment to double-check I was not wrong. I have already learned a couple of things (in English) thanks to community comments. Two birds with one stone! :-)
In Hebrew it's "taking two birds with one strike of the hand" :-)
שתי ציפורים במכה אחת