MY daughter Siobhan overheard her two sons. Lorcan, aged seven, was telling five-year-old Ruairi, a joke he had heard at school.

“Why is mummy like a walrus?” he said.

“Why?” asked Ruairi.

“Because she's fat and smelly and got whiskers.”

Ruairi immediately answered back in defence of his mum.

“She hasn't got whiskers.”

The jury must still be out on the other two.