Harry, Jamie
After talking to Dumbledore, Harry knew he needed to talk to Jamie. He didn't want him to find out about Lily from anyone but him, and as much as he hated the idea of leaving Sirius without Jamie in a room where Peter was, he still needed to talk to James. When Sirius and Reg started to talk, however, he took the opportunity.
"Can I have a moment?" he asked Jamie. "Outside," he said nodding his head. Privacy spells were all good and well, but Harry didn't want to discuss this where anyone else could even see them.
Leaving the house, Harry cast a spell to warn them if anyone else was coming outside, and a privacy spell just to be on the safe side.
"I spoke to your sister yesterday," he then said. "She contacted me on the watch."