This is the answer provided to me, and it is very awkward and weird. Including the ""even have" would make sense in specific discussions where one is making a point. Such as, "You say you met my two brothers? I don't even have ONE brother!" I can't think of any time when "I don't have a brother" wouldn't be the best way to make the point.
Italian does not distinguish between "one" and "a." It either case you use the indefinite article (un, una, un') before a noun (one X). If it stands alone, you use "uno" or "una" depending on the gender of the thing:
Vuoi un biscotto? Sì, ne voglio uno. Do you want a/one cookie? Yes, I want one. (Here "uno" is masculine because "biscotto" is masculine.)
Vuoi una caramella? Sì, ne voglio una. Do you want a/one candy? Yes, I want one. (Here "una" is feminine because "caramella" is feminine.)
If it doesn't refer to a specific thing (say you're just counting or something), you would use "uno."
The best and most frequent usage of "neanche" in daily life is shown here with examples. http://www.adgblog.it/2011/03/10/quando-si-usa-anchio-neanchio-anche-a-me-neanche-a-me/
The most frequent usage of "neanche" in daily life is shown here. http://www.adgblog.it/2011/03/10/quando-si-usa-anchio-neanchio-anche-a-me-neanche-a-me/
Sentences like this cause a lot of trouble, and none of the moderators seem to be able to clarify.
That is something totally different, wouldn't you agree?
In Italian that would be Non ho mai avuto un fratello, if one intended to say that their mother never gave birth to a male sibling, or Non avevo mai un fratello, meaning that one did not grow up having a brother.
Instead, the Italian phrase means either "I don't even have a brother" or "I don't have a single brother, not even one".
Oops, you are right! Now I am no longer sure whether I made the mistake when I verified my answer with Duolingo, or whether I made the mistake while putting my comment here. I suspect that I tried to enter "I don't either have a brother", which would have been better have been expressed "Neither do I have a brother". Thanks for answering my question, though!