Jesus had no brothers or sisters, whether half or not.
Surprised that the Orthodox believe he did.
I'm surprised Maronites reject Scripture.
It is the Gospels which call certain family members of Jesus his "brothers and sisters". Of course, we believe that these are not the children of our Lady, but whether they are children of St Joseph from a previous marriage, or cousins, or what have you, we can't just throw out the concept of "brothers and sisters" when it's in the Gospels and even Jesus doesn't deny it (he expands it).
No we are Catholics we hold sacred scripture and sacred tradition to be equal, much like you.
However, one needs to realise in Hebrew, Old Aramaic, Syriac...and even Arabic there is no word for nephew or niece, nor even a precise word for cousin neither for aunt or uncle in ancient Hebrew or Aramaic - the words that the Jews used in all those instances were "brother" or "sister"
To this day in the Middle East even strangers call each other 'brother' or 'sister' in greeting them, let alone relatives.
but let's stick to scripture then:
An example of my above point can be seen in Gen 14:14, where Lot, who was Abraham's nephew, is called his brother.
Another point to consider. If Jesus had had any brothers, if Mary had had any other sons, would the last thing that Jesus did on earth be to grievously offend his surviving brothers?
In John 19:26-27, right before Jesus dies, it says that Jesus entrusted the care of His mother to the beloved disciple, John. If Mary had had any other sons, it would have been an incredible slap in the face to them that the Apostle John was entrusted with the care of their mother!
Plus The Lord is dying where are his 'brothers' and 'sisters'??
Also, we see from Matt. 27:55-56, that the James and Joses mentioned in Mark 6 as the "brothers" of Jesus, are actually the sons of another Mary.
In addition, one other passage to consider is Acts 1:14-15, "[The Apostles] with one accord devoted themselves to prayer, together with the women and Mary the mother of Jesus and with His brothers...the company of persons was in all about a hundred and twenty."
So a company of 120 persons composed of the Apostles, Mary, the women, and the "brothers" of Jesus. Let's see there were 11 Apostles at the time. Jesus' mother makes 12. The women, probably the same three women mentioned in Matthew 27, but let's say it was maybe a dozen or two, just for argument's sake. So that puts us up to 30 or 40 or so.
So that leaves the number of Jesus' brothers at about 80 or 90! Do you think Mary had 80 or 90 children? She would have been in perpetual labour not perpetual virginity,
No, Scripture does not contradict the teaching of the Maronite Catholic Church about the "brothers" of Jesus, when Scripture is properly interpreted in context.