Adding new list items to an existing parent item

I am at a loss as to how to solve the following problem.

I have a data type (source) which contains fields like ‘author’, ‘medium’, ‘title’ and ‘content’.
‘Content’ is a list of ‘wisdom’ which contains additional items. I set my site up so that users could add new sources, and once a source is added, they can add ‘wisdom’ from the source.

I am completely stumped with adding new items to the list. I cannot understand why the following workflow does not result in wisdoms being added in list style to the source:

Screen Shot 2020-06-27 at 5.12.25 PM Screen Shot 2020-06-27 at 5.12.36 PM

This wisdom is added, but the relationship to the parent source is not picked up.

Welcome to community Bro! show me your workflow when wisdom and source are added

Here they are: