I am Jim.This is my brother and t什么 is my sister

I am Jim.This is my brother and t什么 is my sister And this is my sister,Mary.and this is my brother,Jim用英语怎么说? And this is my sister,Mary_____,Jim My sister is fifteen.My brother is forteen.And I am thirteen This is my sister a什么that is my brother? This is my sister and this is my brother 能不能写成this is my sis Linda is my sister 填什么 is ten .I am 什么 brother 阅读理解短文：I am Susan.Derek is my brother.Lucy and Jim are our c i'm jack brown,and h()is my brother,jim. i am ten.my brother is thirteen.my sister is fifteen.用比较级合并为 My sister Is eighteen and my brother is sixteen My brother is nine and my sister is ( )four