Looks like no one is immune from thinking it is weird that Bobbi Kristina Brown is dating the guy she used to consider her "brother" -- because even their closest friends were shocked by the news ... TMZ has learned.
As TMZ first reported, Bobbi feels she's doing nothing wrong by dating Nick Gordon, the guy her mother Whitney Houston unofficially adopted 10 years ago.
According to our sources, Bobbi broke the news to her friends at a BBQ this week ... and no one believed it until the two kissed in front of everyone. We're told one friend felt the "relationship" was the result of each of them taking the death of Whitney too hard ... but they both brushed off that notion.
Our sources say the rest of the BBQ was quite awkward after that and everyone just tried to change the subject.