This is my family tree. My name is Jack. I'm English. I have a big family. My wife(妻子) Allen is a teacher. We have two children. Tom is my son. Linda is my daughter. They are students in No. 2 Middle School. My father's name is Jeff. My mother's name is Grace. They are at home. Bill is my brother. He is a worker. Nancy is my wife's sister. She is a doctor. My wife's mother's name is Sue. Her father's name is Harry. They are old, too.

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如图，正方形AEFG的边AE放置在正方形ABCD的对角线AC上，EF与CD交于点M，得四边形AEMD，且两正方形的边长均为2，则两正方形重合部分（阴影部分）的面积为（　　）