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Many parents worry about the development of their children. First time parents often have no frame of reference for what their child should be doing by what age.

But that's not the case for Richard Matthews. When his son, Will was growing up it was easy to see differences between him and his twin sister.

Aged 5 years old, Will was diagnosed with XYY syndrome. 16 years on, Richard's now written a book about the trials but also the joys of raising Will. It's called 'No I Will'.