What is this child in front of?
The child is in front of the tree.
    src        edge_attr  dst
0     0   to the left of    2
1     0   to the left of    1
2     0   to the left of   12
3     0  to the right of    3
4     1  to the right of    5
5     1  to the right of    0
6     1  to the right of   11
7     1  to the right of    3
8     1            above    9
9     2  to the right of   12
10    2  to the right of   11
11    2               of    1
12    2  to the right of    0
13    3           behind   11
14    3   to the left of    0
15    3   to the left of    1
16    4  to the right of    5
17    5   to the left of    1
18    5   to the left of    8
19    5   to the left of    4
20    6  to the right of    7
21    7   to the left of    8
22    7   to the left of    6
23    7               by   11
24    8  to the right of    5
25    8  to the right of    7
26    8  to the right of   11
27    9            below   11
28   11   to the left of   12
29   11      in front of    3
30   11   to the left of    1
31   11   to the left of    2
32   11   to the left of    8
33   12  to the right of    0
34   12  to the right of   11
35   12   to the left of    2