I am a loyal and faithful Catholic who practices my faith.
If Mary had other children why would Jesus have appointed John to take care of her.
They were most likely older step brothers and sisters.
You could very well be right. But since Mary and Joseph were in fact a married couple, it is safe to assume they did what other married couples do. Our Lord commands us to be fruitful and multiply. Our Lord created Eve because he did not want Adam to be alone. Our Lord gave us the gift of physical intimacy between husband and wife. Why would that gift be denied to Mary and Joseph? For what reason? Keep in mind celibacy is the Church’s invention, not God’s plan. There is no such thing as Holy Celibacy. God wants us to celebrate life, not celibate life. Our Lord’s plan is for Holy Matrimony and to be fruitful and multiply. Physical intimacy between a husband and a wife is God’s great gift, to be denied to no one, certainly not denied to Mary and Joseph. Also keep in mind that the New Testament specifically permits a married clergy. I refer you to 1 Timothy 3:2. Read it.