[topcat54]

The term used for "brother" can mean cousin etc.

Where is that usage explicitly found in the Bible?

Suggenes vs. adelphos. Since there is a perfectly good Greek word for "cousin", why wasn't it used in these disputed passages?

[Stubborn]

Do not concern yourself with attempting to interpret things that have already been defined infallibly so as to remove any doubt.

I am no language expert, thank God that was not one of the requirements for salvation.