but my little brother is the same like me, INFP, and this i've found out from telling him to take the online MBTI test.
i guess no wonder me & my little brother often feel this 'connection' especially on being "Idealist" thing, and value "abstract, unseen" things over material things. and of all people in the family, my little brother is the only person I can relate, and even have a lot of talks (fun & serious ones) to. the other family members are just confusing to me, and hard to make understand each other.
but indeed, sometimes like you, the similarities kinda end too at some point.
can you tell me where do the similarities "end" , with ur INFP brother ?