根据句意完成句子。
1. We call mother's or father's brother ______.
2. We call mother's or father's sister ______.
3. Maomao's mother is my mother,
but Maomao isn't my sister, but my ______.
4. Eric is my aunt's son. I call him ______.
5. We call father's or mother's father and mother ______.
