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Coming March 2026
PREORDER NOW

Amazon UK

Waterstones

The first book to look at the special – if complicated – sibling bonds that shape us all

'Will leave you wiser and feeling more at home in the world.'

Oliver Burkeman

About

Catherine Carr is an award-winning documentary maker, presenter, podcast producer and reporter.

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Praise for Who's the favourite?

Dame Jenni Murray, only child

This book makes me understand how complex and varied sibling relationships are.

Chris and Xand
van Tulleken, twins

Essential reading. It is our least discussed and most formative relationship and Catherine’s work is a hilarious, moving and fascinating guide through it.

Jane Garvey, oldest

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Truly enlightening, charming and moving. I’ve learned so much…but I’m still angry with my sister for reading my diary!

Coming March 2026 PREORDER NOW