I think you’re beating a dead horse....the context of Matt. 12:46-50 and Luke 8:19-21 shows how the word “brother” is being used, as sharing a parent.
“But I would not say that every Protestant lies all the time, especially one bamboozled since childhood by his pastors.”
I’m sure every Protestant will cherish this generous concession. Especially “one”.
How does the context "show" that?