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The parent key field is the field defined for the current layout table occurrence that is used in a relationship. Say you are on a layout that is linked to a table occurrence named people. All the fields used in relationships in that table are parent key fields. If you move to a layout that is linked to a table occurrence called Invoices, then the key fields in that table are now the parent key fields.
The above picture is taken from the relational graph area of where I store my blog posts.