Suffice to remember, without sexual relations, their marriage was never consumated, and that is why we call the Theotokos "unwedded bride". For all purposes, she was engaged but never married to Joseph. There were not nuns at the time, but that was the kind of life Mary lived all her life, despite current attempts to show "Jesus, Mary and Joseph" as an example to a normal family which they were not. So, in order to live a consacrated life, she had to "marry" a man who would agree in having her but only in order to fulfill social and legal requirements, since it would not be acceptable for a woman to live without "belonging" to a man. As said, the Orthodox position is that St. Joseph was already in old age and widowed when he was requested to "marry" Mary so she could live a life consacrated to God. A man well over his 60s, with children and grandchildren, getting married to a girl between 13 to 15 would *never* be an example if that was an actual normal marriage. Only in the context of an old man accepting the social marginalization to protect both the vocation and honor of a young saint-nun and God Himself that makes sense: Joseph is a priest before the altar, not a dad.
Mary is a reference for all, but specially for monastics who are born with the natural inclinations toward the vocation, and St. Joseph, who had a wife and children, a model for those who are later in life called to a sacerdotal life in his dedication to Jesus and the Theotokos. If we want to look up to a "Holy Family" reference we can use the traditional one, even commemorated in our feasts St. Joachim, St. Anne and the young Virgin Mary and to a certain extent her relatives Elizabeth and Zacariah. There you have not only the traditional but the adequate reference for holiness in family. They have a normal family life, with daily duties, they have sexual relations, they despair, they hope, they argue, they reconcile. St. Joachim is considered to be the traditional reference of fatherhood, not St. Joseph, for the simple reason that St. Joseph's relation to Christ and the Theotokos was more a type of the role of the Christian priest than that of a husband and father.
See the icons below, depicting the flight to Egypt. St. James was already born, and either a pre-adolescent or adolescent, when Jesus was born. He, like the other "brothers and sisters" of Jesus were "half-brothers", and even in that, not legally and in the heart only, since Joseph and Mary's marriage was never consumated, hence why Jesus had to put His mother under the responsibility of a really blood-related cousin.