看图阅读对话，选择适当的单词填入相应的空白处

father, boy, sister, grandpa, mother

A：Excuse me, Long Fei. Is that a photo your family?
B：Yes, it is.
A：The ____1___ must be you.
B：That’s right.
A：Is the girl your ___2_____?
B：Yes. She’s my sister Long Mei.
A：Who’s the man behind you?
B：He’s my ____3_____.
A：Is the woman your ____4______?
B：Yes, she is.
A：Who’s the old man?
B：He’s my ____5______.