Pygraphviz / networkx set node level or layer

Question

I have a dataset that represents a kind of genealogy tree. Each node has 2 parents (except first generation, they have no parents). For a given node, its parents can be from

Answer 1

As of 2017, the function to_agraph is no longer exposed at the nx.level. Now you must call nx.nx_agraph.to_agraph()