The sons tell their father where they went on their unplanned journeys and what they ate. After each son answers the father will admonish him, telling him of the dangers he could have faced. Each of these dangers centers around men and boys, which is unsurprising given that the nest was damaged by bad boys simply for the sake of causing trouble.
The sacrifice of gods and sacred kings was a sacred rite meant to bring life back to the land and ensure a bountiful harvest in the fall. It was a rite of renewal and hope.
This is not a story that I was super-familiar with but apparently the rest of everyone is VERY familiar with it! It's really long for a Grimm tale, it has multiple tale types, multiple variants in multiple countries, and it MAY have influenced Tolkien. It's like a little hidden folklore bomb!
In reading the story, it's wildly obvious that this is a Christian allegory. And while I immediately understood the reference to "Abraham, Isaac, and Jacob," I was a little thrown as to who the Goose Boy actually was. I mean, I may know an absurd amount when it comes to mythology and folklore but the Bible has never been an area of focus for me. So my first thought was that it was about King David, of "David and Goliath" fame.
There are reams of lore and academic texts and hypotheses and theories about who she was, where she came from, and what she became. But in studying the fragments, it's not hard to see how women would find a kindred spirit in her. All the stories seem to agree that Lilith was passionate and wanted to be independent.