A web search yielded an exegiesis on this GMark "mother and brothers" passage
DAVID N. BIVIN & JOSHUA N. TILTON 2019MAY30
gryan wrote: ↑Mon Mar 08, 2021 9:50 am
Re: the identity of "those near him [Jesus]"
In the previous verse, it says "he (singular) comes into a house." Maybe he had left the 12 to go their separate ways for the night.
DAVID N. BIVIN & JOSHUA N. TILTON commented:
"καὶ ἔρχεται εἰς οἶκον (Mark 3:20). Scholars have noted that the use of the third person singular ἔρχεται (erchetai, “he goes”) is a bit unusual, since, following Mark’s version of Choosing the Twelve (Mark 3:13-19), readers would have expected the newly-appointed apostles to have accompanied Jesus.[11] This is only the first instance of apparent lack of agreement between verb and subject in Mark 3:20-21. The use of the “historical” present tense is both un-Hebraic and typical of Markan redaction.[12] Likewise, the mention of an unspecified house (Where is it? To whom does it belong?) is characteristic of Markan composition.[13] In the present case, it appears that the author of Mark located Jesus inside a house in order to create a contrast with Jesus’ family members, who will be left “standing outside” in the second part of the narrative (Mark 3:31; L18).[14]"
https://www.jerusalemperspective.com/18044/
gryan wrote: ↑Mon Mar 08, 2021 9:50 am
In that scenario, "those near him" could have been some of the 12 who "heard" and then "went out [from their respective houses nearby] to take him in hand" because they thought that, in his mental state, he needed their help.
DAVID N. BIVIN & JOSHUA N. TILTON commented:
"οἱ παρ᾿ αὐτοῦ ἐξῆλθον (Mark 3:21). As we have already noted (see above, Comment to L6-10), identifying the referent of οἱ παρ᾿ αὐτοῦ (hoi par avtou, “the ones by him,” “the ones from him”) is fraught with difficulty. In Classical Greek οἱ παρά τινος (hoi para tinos, “the ones from someone”) typically referred to emissaries or representatives that came from someone,[41] but in Koine Greek the meaning was extended to “those associated with someone.”[42] Several times in 1 Maccabees, for instance, the phrase οἱ παρ᾿ αὐτοῦ refers to the supporters of Jonathan or Simon, brothers and successors of Judah the Maccabee (1 Macc. 9:44, 58; 10:87; 12:27, 28, 29; 13:52; cf. 1 Macc. 15:15; 16:16). In other cases, the “associated persons” indicated by the phrase οἱ παρά τινος are family members. The following examples are frequently cited in this regard:[43]
οὐ φροντίζει τῶν ἐν οἴκῳ ὁ ἀνὴρ αὐτῆς, ὅταν που χρονίζῃ πάντες γὰρ οἱ παρ᾿ αὐτῆς ἐνδιδύσκονται
Her husband is unconcerned for those in the house when he is long delayed, for all that are hers [οἱ παρ᾿ αὐτῆς] are clothed. (Prov. 31:21)"
καὶ Ἅβραμος μὲν ἐπὶ τούτοις εὐχαριστήσας τῷ θεῷ περιτέμνεται παραχρῆμα καὶ πάντες οἱ παρ᾿ αὐτοῦ καὶ ὁ παῖς Ἰσμαῆλος
And Abram gave thanks to God on account of these things and was immediately circumcised, also all that were his [οἱ παρ᾿ αὐτοῦ], even the child Ishmael. (Jos., Ant. 1:193)
It should be emphasized that while these examples do show that οἱ παρ᾿ αὐτῆς/αὐτοῦ can refer to a woman’s or a man’s family members, the phrase does not mean “family” or “relatives.”[44] It is the context that determines the referent of οἱ παρά τινος. In Prov. 31:21 the wife cares for those under her charge, and some of those (her children) happen to be family members. In Josephus’ paraphrase of the story of Abraham’s circumcision, we know that the commandment to circumcise applied to all of Abraham’s male slaves and offspring. By contrast, nothing in Mark’s Gospel has prepared readers to expect a reference to Jesus’ family. Therefore, readers can be excused if at first they assume that οἱ παρ᾿ αὐτοῦ in Mark 3:21 refers to the apostles. The apostles, after all, had just been appointed by Jesus ἵνα ὦσιν μετ᾿ αὐτοῦ (“so that they might be with him”; Mark 3:14), and so are the first of those who belong to Jesus who come to mind.[45] It is only when the reader continues with the rest of Mark 3:21 that he or she realizes that οἱ παρ᾿ αὐτοῦ must refer to persons other than Jesus’ apostles."
https://www.jerusalemperspective.com/18044/
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This level of detailed exegesis is rare. The work is grounded in "Jerusalem school hypothesis" (which I had not heard of before this morning):
https://en.wikipedia.org/wiki/Jerusalem ... hypothesis