[ET(end tyranny)]

Until we're all using the same translations, this is all useless.

Meaning the Aramaic texts? Or the doctored Greek?

[aristeides]

We don't have the presumed Aramaic original of Matthew. We have to use the Greek which we do have, or a hypothetical reconstructed Aramaic version.

However, on this matter I think you have a point. "Adelphos" at Matthew 13:55 can pretty much only mean "brother" -- I do not recall ever seeing the word used for a cousin, say. On the other hand, such an extended use of Hebrew "'ah" seems, to judge by my lexicon, common, and I would guess the same is true of the Aramaic equivalent.