阅读短文，判断句子正(T)误(F)。
Today is my grandpa's birthday. He is seventy. We're going to have a birthday party for him. I'm going to buy a gift for my grandpa. And I can sing a song at the party. My sister is going to dance for our party. Look, my mother is cooking. What can my father do for the party? Ha ha, he is going to take photos for us. We feel very happy.
1．Today is my grandma's birthday. （________）
2．My grandpa is seventy. （________）
3．I'm going to dance for the birthday party. （________）
4．My mother is going to sing a song at the party. （________）
5．My father is going to take photos for us. （________）
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