How Relations are created between vertex in graph

Hi Sir,

I can see the relation between the vertex in graph api but i cannot understand which vertex is parent and which vertex is child how to find that through graph api

There’s no concept of parent and child in graph, they are simply linked vertices.

but graph will be related based on level hierarchy so how to know which vertex belong to which level
Lets say A is parent of B and C so

   A    -----level 0

B C ------level 1
How to find this in graph
What algorithm they use to create graph

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