Well that is truly an unusual question, I think we can open a thread on these type of questions.
I once had the pleasure of accompanying a childhood friend to his prospective in laws place, so he could officially ask permission from his future in laws.
His mother in law asked him: " Is your mother alive" , next question was "how many sisters do you have". I was sipping tea, and believe you me it took all my will power not to burst in to laughing my behind off.
As soon as they were out of the room, I told him, you should have said: "Aap fikr na karian, shadi say pehlay sub ko mardoonga"