The book portrays their father as an 'ogre' who mistreated them.
the 'ogre' of inflation
(..) Spin around like a crazy elf Dancing by himself Boogie down like a unicorn No stopping till the break of dawn Put your hands up in the air Like an ogre who just don't care Can you dance like a Hippogriff? Ruddy pumpkinhead, isn't he? I don't think it was the books that had him going to the library. (..)2005 Harry Potter and the Goblet of Fire