only son
Noun
Meaning
A sole male child among multiple siblings.
Used other than figuratively or idiomatically: see only, son.
He was the only son to go to college.
Examples
My birth neither shook the German Empire nor caused much of an upheaval in the home. It pleased mother, caused father a certain amount of pride and my elder brother the usual fraternal jealousy of a hitherto only son.
The care of a wise and good man for his only son is inferior to the regard of the great Parent of the universe for his creatures.
There once was upon a time a poor widow who had an only son Jack, and a cow called Milky-White.
My father is a very successful man in the corporate world, and I am his only son. He had certain dreams for me. I was scared to tell him that I wanted to be an actor.
In Korea, it's a tradition to inherit your father's business. Unfortunately, I'm the only son in the entire family, so they were forcing too much.
The story of Jesus makes no sense to me. God sent his only son. Why could God only have one son and why would he have to die? It's just bad writing, really. And it's really terrible in about the second act.