Carina looked puzzled by what was being said. "But you know, don't you?" she asked, looking at Bellatrix, then at Rodolphus. It was a secret, of course, but certainly family knew, didn't they?
Rodolphus, sensing they could well lose any advantage without quick action, suddenly laughed jovially. "Oh, I know, but it was a surprise for Tante Bella. We have been away, you are very smart so I know you knew that, and I brought you here to tell her." He grinned, nodding at Bellatrix. "So go on, whisper it in her ear."
Carina paused for a minute and then suddenly giggled. It made sense enough, that Tante Bella and Oncle Roddy had been away and hadn't been told yet. Leaning in, Carina cupped her hand around Bellatrix's ear, then whispered her secret. "Papa is Regulus Aiden Black."