Based on Friendly Defenders:
Was Jesus an Only Child?
Does Matthew 13:55-56 really prove that Jesus had brothers and sisters?
No. Scripture often calls close relatives "brothers and sisters." For example, Abraham and Lot were called "brothers," but Abraham was really Lot's uncle.
"...and they were separated one brother from the other." Genesis 13:11
The "brothers and sisters" of Jesus were actually close relatives, not children of His mother Mary.
Related verses: 1 Thess. 2:9; Lev. 10:4; Gen. 29:15; 1 Chr. 23:21-22
“I think it's very important to be able to see the funny side of life and its joyful dimension and not to take everything too tragically. I'd also say it's necessary for my ministry. A writer once said that angels can fly because they don't take themselves too seriously. Maybe we could also fly a bit if we didn't think we were so important.”–Pope Benedict XVI