Board Thread:Episode Discussions/@comment-3261234-20150416133517/@comment-3279282-20150416165112

Which honorifics? Because usually, if someone calles someone brother or sister, they are related. Things like Konohamaru and Naruto are exception. Plus, this is a filler and we won't get any kind of deep explanation. It's okay to list them as siblings when they call it each other.