Why would they be? I doubt that God would have tasked Joseph as Jesus' earthy father if he were divorced. I guess widowed is possible
There is a common belief that Joseph was a widower and that Mary was his second wife. This is because Joseph just vanishes from the story without a trace. He just doesn't seem to be around when Jesus is an adult. The obvious explanation is that he is dead by then, which suggests someone older than Mary. That view has influenced artwork like this:
There is also a question of family dynamics. It seems that John was a (younger) cousin of Jesus (if you compare the names of women at the cross, his mother was probably Mary's sister). John seems to have had great respect for Jesus from the very start.
But with older half-brothers of Jesus, it is perhaps more likely that we might have some behaviour like the sons of Jacob ("who is this boy that thinks he's so special?").
Of course, it's still possible that some of Jesus' brothers (James and Jude, perhaps) were among the 12 disciples.
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