"'So that's little Scorpius,' said Ron under his breath. 'Make sure you beat him in every test, Rosie. Thank God you inherited your mother's brains.'
'Ron, for heaven's sake,' said Hermione, half-stern, half-amused. 'Don't try to turn them against each other before they've even started school!'
'You're right, sorry,' said Ron, but unable to help himself he added, 'don't get too friendy with him, though, Rosi. Granddad Weasley would never forgive you if you married a pure-blood.'"