Books exploring interesting siblings dynamics

Aside from being an avid reader I'm also an avid fan of TV shows and I'm often drawn to TV shows centered about siblings – think Succession, The Other Two, The Righteous Gemstones, Bad Sisters, Six Feet Under. Any books recommendations along these lines? I'm open to any setting and any tone, really as long as it's about siblings and the relationship between them is complex and messy. I'm mostly interested in litfic.
I'm especially interested in stories about blended families, large age gaps, the scapegoat-golden child dynamics, but I'm open to anything 🫡