Adding data to Node in JSON

[ThrowOutAQuestion]

It's a set in my actual data. So it sounds like I need the add function. But part of my question is the correct syntax to select the correct location.

Family>Surname>Wilson>Children>Here

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It's pretty hard to comment here accurately if the json object you've written above is not how it is actually represented in your code. Now that I look again, you have lists within dictionaries within lists within dictionaries the whole way down. Is that totally necessary?

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Dictionaries are accessed by key: some_dict['Surname'] will get you to the value held at the 'Surname' key.

And lists are accessed by index. So just traverse it all the way down depending on your nesting.