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根据短文内容，回答下列问题。
Terry is 65 years old this year. He is from America. He makes a tree house for his family this year. It's very beautiful.
The tree house is in his back yard with two beds, ten seats and a BBQ. It can hold (容纳) ten people. It is big and brown. Terry spends six months making the tree house. And he gets some help from his good friends.
Terry's friends also like this tree house very much. They often have fun in it. They talk, play games, and listen to music together. "I am happy to share the tree house with my family and my friends." Terry says.
People call him "World's Best Grandpa". Do you know why? Because he makes a cool tree house for his family.