Wiktionary
n. 1 (&lit only son English) 2 A sole male child among multiple siblings.
Usage examples of "only son".
Seemed like the ideal opportunity to catch a lift from my only son.
After the death of Pithaim, Zotulla, being his only son, was emperor of Xylac, and ruled evilly from his throne in Ummaos.
The Creole gentleman, a man of some means and influence, had retained the services of prominent attorneys to save his only son.
I heard afterward that it was young George Gordon, the squire's only son, a fine, tall young man, and the pride of his family.
In this the love of God was made manifest among us, that God sent his only Son into the world, so that we might live through him.
Ilioneus was his only son, and Peneleos now wounded him in the eye under his eyebrows, tearing the eye-ball from its socket: the spear went right through the eye into the nape of the neck, and he fell, stretching out both hands before him.
He was ill-favoured, but a good runner, and was an only son among five sisters.
I then fled through Hellas till I came to fertile Phthia, mother of sheep, and to King Peleus, who made me welcome and treated me as a father treats an only son who will be heir to all his wealth.
But the only son of their protectress had the management of her property.
You must be sensible that as an only son, and the representative of an ancient family, your conduct in life is most interesting to your connections.
When my grandfather heard this he wept, and bemoaned himself that his folly in forcing one into the Church who had no liking for that path, had brought about the shameful end of his only son.
Her whole life was a round of devotion and of love, which was divided between her husband and her only son, Harold.