The best thing (in this Prot's opinion) that pope Francis could do; would be to order a new translation of the Scriptures.
One that actually HAS 'cousin' in place of brother where it 'should' be.
Then all of these convoluted claims by FR Catholics about 'brother/cousin' would be OVER!
How 'bout it Francis?
The closest in English might be "close kinsmen."
Even better would be "brothers," with a footnote explaining usage.
Your tone, by the way, is belligerent. Tone it down a bit, maybe?
Brother?