Rose tells her mum and dad that she is going out with Scorpius Malfoy, although it probably wasn't the best moment for it.

‘Do we really have to have this conversation here, now?’ she pleaded
 
Harry had the grace to look ashamed and avert his eyes, Ginny, however, stared at them intently unaware that her family’s presence was making this all the more awkward for Rose.
 
‘But I’m your brother!’ whined Hugo