What is the child in front of?
The child is in front of the display.
    src        edge_attr  dst
0     0  to the right of   15
1     0  to the right of   18
2     0  to the right of   14
3     0  to the right of   19
4     0  to the right of   11
..  ...              ...  ...
90   19   to the left of   14
91   20  to the right of   19
92   20  to the right of    5
93   20  to the right of   12
94   20  to the right of   16

[95 rows x 3 columns]