We're learning how important it is both to preserve sibling relationships if they work and repair them if they're broken. We're also learning a lot about nonliteral siblings - stepsiblings half-siblings - and the surprising power they can have.
The waltz can be sad and at the same time uplifting. You have to see life from both sides and the waltz encapsulates that. If you're in my audience you give yourself to me and the waltz will grab you.