Question

تک پسر به انگلیسی چی میشه؟

Answer 1

If the boy has no sisters: an/ the only child (He's an/the only child of his parents/ family.)

If the boy has sisters: an/ the only son (He's an/ the only son of his parents/ family.)

Comments

Good answer, +1

http://forum.wordreference.com/threads/im-the-an-only-son.2558478/