What is the best way to link objects in a large parent-child tree?

Question

Django

It is necessary that each object stores the id of all its ancestors (each level has its own field), and each parent - the id of all its children (all in one field)
Manually, in the form of a model, the administrator selects only the closest ancestor, the rest of the chain is written independently
How is it better do?
PS All objects belong to the same model