I bought an iPhone 6s recently and my brother did so too, we just come pared them and it appears that my iPhone 6s doesn't have a default News app (the one that can't be deleted) but my brother does. Why is that?
On the apple forum it states from Sept. 24th that the news app is only available in the US. Maybe the phone of your brother has a US iTunes store account or was bought there?
I found the solution. I just changed my region in the settings to United States, which restarted my iPhone when applied and adds the app.