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Other early documents and Tradition confirm her perpetual virginity.

...and so?

Are there other "early" documents that you also adhere to?

Is THIS one?

Papal Condemnation (Sentence) of Galileo
(June 22, 1633)

I'll assume not.

Now, you explain this:
Καὶ ἐξῆλθεν ἐκεῖθεν, καὶ a ἔρχεται εἰς τὴν πατρίδα αὐτοῦ, καὶ ἀκολουθοῦσιν αὐτῷ οἱ μαθηταὶ αὐτοῦ. καὶ γενομένου σαββάτου ἤρξατο [ διδάσκειν ἐν τῇ συναγωγῇ] · καὶ a οἱ πολλοὶ ἀκούοντες ἐξεπλήσσοντο λέγοντες· Πόθεν τούτῳ ταῦτα, καὶ τίς ἡ σοφία ἡ δοθεῖσα b τούτῳ, καὶ c αἱ δυνάμεις τοιαῦται διὰ τῶν χειρῶν αὐτοῦ d γινόμεναι; οὐχ οὗτός ἐστιν ὁ τέκτων, ὁ υἱὸς a τῆς Μαρίας [ καὶ ἀδελφὸς] Ἰακώβου καὶ b Ἰωσῆτος καὶ Ἰούδα καὶ Σίμωνος; καὶ οὐκ εἰσὶν αἱ ἀδελφαὶ αὐτοῦ ὧδε πρὸς ἡμᾶς; καὶ ἐσκανδαλίζοντο ἐν αὐτῷ. (Mark 6:1-3)

The use of the words: adelphos and adelphē are IMPORTANT because of the CONTEXT. Even though the words can have different meanings, here they mean "siblings". You must interpret scripture with scripture. Otherwise, your hermeneutics is flawed. (2 Tim 2:15)
Here is the ESV:
He went away from there and came to his hometown, and his disciples followed him. And on the Sabbath he began to teach in the synagogue, and many who heard him were astonished, saying, "Where did this man get these things? What is the wisdom given to him? How are such mighty works done by his hands? Is not this the carpenter, the son of Mary and brother of James and Joses and Judas and Simon? And are not his sisters here with us?" And they took offense at him.

You really need to READ and STUDY (the Bible) more than you LISTEN (to fables.) Otherwise, you are on a path to destruction. You can't serve two masters. This is true for you, me, and everyone else here.