"My younger brother is living in London this year."
When you're talking about family members, it's not necessary to add "的." In fact, it sounds strange to do so.
In my Chinese lessons I learned that 在 would come before the verb, so 在伦敦住。 Now Duolingo says I'm wrong. Did I miss anything?
I thought that the DE was a trap so I didn't use it because it's the rule but in fact it was just an error... Please correct it