Because this apostolic conflict is not resolved within the lifetime of Paul, Sim claims that later Christian authors were forced to align themselves with one figure or the another, and he argues that Mark chooses to position himself with Paul. Sim first looks at Mark’s attitude towards Jesus’ family. At Mk 3:20-35, which opens with Jesus’ returning “home” (ἔρχεται εἰς οἶκον [Mk 3:20], likely a reference to the place he was staying at Capernaum [see Mk 2:1]), Mark informs his audience that Jesus’ family (οἱ παρ᾽ αὐτοῦ) attempted to restrain him (κρατῆσαι αὐτόν) because they believed he was “out of his mind” (ἔλεγον γὰρ ὅτι ἐξέστη [Mk 3:21]). Sim takes Mark’s use of ἐξέστη (“out of his mind”) to imply that Jesus’ family believed him to be possessed by a demon.18 Because the Beelzebul controversy with the scribes (Mk 3:22-30) immediately follows, Sim infers that, with his pronouncing blasphemy against the Holy Spirit an eternal sin (Mk 3:29), Jesus implicitly declared his family guilty of the same sin as the scribes. By calling him mad, they have blasphemed the Holy Spirit within his person
(extracted from C. E. Ferguson, A New Perspective on the Use of Paul in the Gospel of Mark, my bold)
- A mother for Jesus was introduced not by Mark but by the Book of Revelation (I am assuming that "born by woman" of Gal 4:4 is a catholic interpolation meant to harmonize Paul and Mark with the Book of Revelation).
Volkmar was right: Mark hated the Book of Revelation.