J.k. Rowling said this quote
“ Makes a diff'rence, havin' a decent family,' he said. 'Me dad was decent. An' your mum an' dad were decent. If they'd lived, life woulda bin diff'rent, eh?''Yeah, I s'pose,' said Harry cautiously. Hagrid seemed to be in a very strange mood.'Family,' said Hagrid gloomily. 'Whatever yeh say, blood's important... ”