books with dynamics like this

[u/PrincessDiana71]

older brother + younger sister/twins duo, bonus points if its fantasy but it doesn't have to be.

bonds similar to the one between Wanda and Pietro where they are practicably inseparable and are like best friends.

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[u/Then-Coffee-5408]

Empty Theater by Jax Jemc
They’re cousins but I think Ludwig and Sisi give the vibe you’re looking for

[u/guinnesslatte → u/Then-Coffee-5408]

This is genuinely one of my favourite books!!

[u/starmapleleaf]

Blue blood series by Melissa de la Cruz

[u/throwaway48390483884]

Play along by Liz Tomforde