Traduction :Vous êtes tous deux très proches l'un de l'autre.
German Tree (for English speakers)
Duolingo Translation: You two are very close.
Most useful comment (In my opinion):
SelphieB: "Well, the word-for-word translation is 'You both stand yourselves very close'...don't know if that's so useful though. 'Ihr beide' means 'you two'. '(sich) nahestehen' means to be close, it's a reflexive verb so here it requires 'euch' (yourselves, or better, to each other). "