うちの長男はやさしい。
長 = long, head of …, 男 = man, male
However, 長男 doesn’t mean “a long man” though. It means the oldest son (of a/one’s family).
I thought I will list all the words relating to children today.
| 子 | こ | a child |
| 息子 | むすこ | a son |
| 娘 | むすめ | a daughter |
| 長子 | ちょうし | the oldest child (male or female) |
| 次子/第二子 | じし/だいにし | the second child (male or female) |
| 長男 | ちょうなん | the oldest son (doesn’t have to be the oldest child) |
| 長女 | ちょうじょ | the oldest daughter (doesn’t have to be the oldest child) |
| 次男 | じなん | the second son |
| 次女 | じじょ | the second daughter |
| 三男 | さんなん | the third son |
| 三女 | さんじょ | the third daughter |
| 末っ子/末子 | すえっこ/まっし/ばっし | the youngest child |
| 末男 | まつなん | the youngest son (rarely used) |
| 末女 | まつじょ | the youngest daughter (rarely used) |
| 実子 | じっし | one’s child by blood |
| 嫁 | よめ | a daughter-in-law (recently some men in the younger generation call their own wife 嫁 also instead of 家内) |
| 婿 | むこ | a son-in-law |
| 継子 | ままこ/けいし | a step child |
| 養子 | ようし | an adopted child |
