noun
only son
Refers to a male child who is the sole son in a family; may be used when there are daughters but no other sons, or when the child is the only one overall.
彼は一人息子で、兄弟がいません。
He is an only son and has no siblings.
一人息子を甘やかしすぎる親もいる。
Some parents spoil their only son too much.
Standard kanji spelling; high frequency in news and general usage.
Mixed kana-kanji spelling; sometimes used for readability or emphasis.
Variant using numeral １ instead of kanji 一; seen in some contexts but less common.
Compound of 一人 (ひとり, 'one person') and 息子 (むすこ, 'son').