I don't know if Mary had other children of her own, this was never stated anywhere that I know of. But, Joseph was quite older than Mary and had previous marriage (wife died) with children. So you are correct with the half brother/sister statement here. Why do you think this is a lie? How do you know this?Christ ... was the only Son of Mary, and the Virgin Mary bore no children besides Him ... I am inclined to agree with those who declare that 'brothers' really mean 'cousins' here, for Holy Writ and the Jews always call cousins brothers.
yet other so called teachers state that Joseph had these other children, making them half brothers and sisters.
just one lie after another and disregard what those who walked with Jesus said.
beleive a lie and be dammed, that is the future of almost all catholics, hopefully some will realize that men like luther were liars.
Luther? do you mean Lucifer?