Roald Dahl 
Twits, Y [PDF ebook] 

With filthy hair all over his face and horrid plots growing in his mind, Mr Twit is one of the nastiest people you”ll ever meet and Mrs Twit is just as bad and even uglier! But they don”t stop at tricking each other. Neighbouring children, and even the local birds, are in danger. That”s where the Muggle-Wumps come in. A Welsh adaptation of
The Twits.