为什么Is this your brother?回答是yes,it is 不是yes he is.为什么Is this your brother?回答是yes,it is 不是yes he is. 而 Is this your sister? 回答是yes,shi is

为什么Is this your brother?回答是yes,it is 不是yes he is.为什么Is this your brother?回答是yes,it is 不是yes he is. 而 Is this your sister? 回答是yes,shi is
为什么Is this your brother?回答是yes,it is 不是yes he is.
为什么Is this your brother?回答是yes,it is 不是yes he is. 
而 Is this your sister?  回答是yes,shi is

为什么Is this your brother?回答是yes,it is 不是yes he is.为什么Is this your brother?回答是yes,it is 不是yes he is. 而 Is this your sister? 回答是yes,shi is
你确定sister那个是she is?