The "protective big brother" or "nurturing big sister" tropes have dissolved.

When exploring brother-sister romantic storylines, it's essential to consider the following themes:

Using the brother's best friend as the romantic interest to create internal family tension.

“If they recalibrate us,” he said, voice cracking, “we’ll wake up tomorrow feeling… correct. We’ll feel fond. Polite. We’ll trade holiday messages. And we’ll never understand why we feel so empty.”

: The psychological and emotional aspects of sibling relationships could become a focal point, with more emphasis on the deep emotional bonds that siblings share, potentially leading to more nuanced portrayals in media.

The world of relationships is changing, and it's up to us to navigate these changes with empathy, understanding, and an open mind. The future of brother-sister relationships and romantic storylines is uncertain, but one thing is clear: it will be a wild and fascinating ride.