Do you for a moment think that Jesus loved +John more than His own blood "brothers?" God is nor partial. Do you think His blood "brothers" would not have loved their own Mother? You don't think they would have raised legal issues with +John taking custody of their Mother? And do you think the Jewish and Roman authorities would have listened to +John's argument that His Lord, who had been condemned to death as a common criminal, told him to behold His Mother while dying on the Cross? That would really carry a "lot" of legal weight, Blogger.
Obviously (for whatever reason), ... it never came to that.
BTW ... I don't think that any other hypothetical sons of Mary would have a "right" to her ... as much as a "responsibility" for her.
Jesus, at the cross (where His brethren most likely were not) ... took care of providing for Mary's care ... by placing her with John.
Taking into account that Jesus' brethren were not believers at this point; ... while Mary and John were, ... and of the sharp divide in the Jewish community that belief on Jesus caused, ... it is not at all unfathomable that the two groups (believers and unbelievers) ... would choose to go their own way.
So, you are saying that her own "children" didn't love Mary as their "mother" because they didn't share her belief, and abandoned her? Wow!