Precious posting: Was this the source of family wealth that allowed Jesus time to read, to wander the country side preaching, and for James to become President of the later Jerusalem Christian congregation and family members to continue in that position after his death? We can only make some assumptions.
Let's have a closer look at the family Jesus belonged to. I'm sure everyone's read Mark 6:3, but just in case anyone has already forgotten the verse, it reads:
Isn't this the carpenter? Isn't this Mary's son and the brother of James, Joseph, Judas and Simon? Aren't his sisters here with us?" And they took offense at him. (NIV).
The New Living Translation translates it somewhat differently (not sure about the scholarly basis for their selection of words):
Then they scoffed, "He's just a carpenter, the son of Mary and the brother of James, Joseph, Judas, and Simon. And his sisters live right here among us." They were deeply offended and refused to believe in him.
But we get the drift, after Jesus got up and preached in the Nazareth Synagogue, everyone was surprised (to say the least). They had known him as a carpenter, and they knew his brothers. And, it's possible that the family accept some of the husbands of the daughters into the business. Likely with all working together in the family business, and with their proximity to Sepphoris, they did well, and they all became prosperous.
We can also wonder about the role that Jesus had in the business? It seems he had a charismatic personality, so maybe he was something like the sales manager in a contemporary business, handy with words and carpentery tools, we see from his parables that he knew, and was on familiar terms with farm owners and managers, the middle class people employed by the wealthy to manage their investments.
In the beginning, outside of Mary, it seems that no-one else in the family believed he had a divine mission and it certainly is not clear when any of his brothers began to believe. But it is also clear that James and Jude did, and according to the church historians Eusebius and Epiphanius, that James and also Simon (Simeon) were the first two 'bishops' of the Jerusalem congregation. There's other evidence that Jude's grandsons played a role in the church during the end of the first century CE, that was back in Galilee, after all Jews were driven out of Jerusalem by the Romans. So in some ways, it seems, the early church was dominated by the family of Jesus.
We ought to be asking what their influence was? To what extent did they influence doctrine? And to what extent were they influenced by Jewish-Hellenistic culture? Some scholarship argues that more than 20% (conservatively) of the population spoke Greek in public. There were even schools in Jerusalem that trained Jewish teachers in Greco-Roman rhetoric. Its also estimated that between 125,000 and 500,000 pilgrims from outside Palestine would visit Jerusalem for the major Jewish festivals. (Refer Acts 2:5-11) Greek was the common language used by nearly all.