根据下面家谱图，选择正确答案。
1. This is ___________ family tree.
A. Peter's
B. Linda's
2. John is Peter's ___________.
A. grandfather
B. grandmother
3. David is Peter's ___________.
A. aunt
B. uncle
4. Lily is Peter's ___________.
A. sister
B. brother
5. There are ___________ people in this family tree.
