He knows he's a dad when...

... He gets a good telling off for singing the right words to a song...

He knows he's a dad when...

... Christmas Eve consists of reading a rather marvellous pop-up version of 'Twas The Night Before Christmas' and constructing large garden toys...

He knows he's a dad when...

... He starts devising snowman mythology...

He knows he's a dad when...

... He fashions a special 'snowman making tool' and then spends 90 minutes utilising it...