"Yang mana menantu kamu?"

Translation: Which one is your son-in-law?

[Deinonysus]

Could this also mean "which daughter-in-law are you"?

[DanielCark]

Yes, it's either. From KBBI: menantu/me·nan·tu/ n istri atau suami dari anak kita

[8enP1jip]

I think the sentence sounds fine without the word 'one' in it.

[rbr7dl]

Which one is your son-in-law? = Yang mana satu menantu kamu? or Yang mana satukah menantu kamu?

[joeldipops]

The "Correct" answer also had the numeral "1" instead of the word "one" which is not at all natural.

[Anna604889]

Ipar/menantu stand both for sister-in-law and brother-in-law and daughter-in-law !?

[Rick392366]

menantu = son-in-law, daughter-in-law

ipar = brother-in-law, sister-in-law

[Jan850798]

Is it not better to use "who" when referring to a person: Siapa memantu kamu?