How old are the twin's?哪错了?

How old are your twin brother? (How old)(are)(the twins')(mother).这句话中哪一个（ ）里错了, The coats are over there A twin B twins C twin's D twins' How old are your brother这个句子那错了 How old are your brother那错了 By the way how old are you How old are the twins改错 How old is dad?Son:dad,how old are you?Dad:last year's age p how much are the shoe哪错了? 回答 What's your name?How old are you? How old is your ____!A,sisters B、twins C、twin sister D、twin how old are you