it is a very unusual scenario, a man being betrothed to a woman who is essentially a nun, it implies that in fact it is not a conventional marriage but in fact that Joseph must also be a monk, he had no concubines or handmaidens, they were very poor, in fact, also another sign of it being a monastic partnership
that's what i mean, the backstory is where everything is with the parents of Jesus
almost like they were part of a type of monastic order that had direct relations with the Angels