Chinese family tree in pinyin

Here is a Chinese family tree written in pinyin:

1. wài wàipó: grandmother from the father's side
wài wàigōng: grandfather from the father's side

wàipó: grandmother from the mother's side
wàigōng: grandfather from the mother's side

2. bàba: father
māma: mother

3. érzi: son
nǚér: daughter

4. gēge: older brother
mèimei: younger sister

5. jiějie: older sister
dìdi: younger brother

6. háizi: child/children