Who is riding?
The child is riding.
    src        edge_attr  dst
0     0   to the left of    9
1     1   to the left of    2
2     1   to the left of    4
3     2  to the right of    1
4     2   to the left of    4
5     3   to the left of    9
6     4  to the right of    1
7     4  to the right of    2
8     6          wearing    7
9     6        riding on    8
10    6   to the left of    9
11    7   to the left of    9
12    8   to the left of    9
13    9  to the right of    3
14    9  to the right of    0
15    9  to the right of    8
16    9  to the right of    6
17    9  to the right of    7