The Grandest Game ended years ago, but the scars were still there.
Jameson told Grayson and Lyra to go to hell after Avery went AWOL because Grayson told Lyra about Alice Hawthorne being alive when she was supposed to be dead. Avery was rescued, but there was a drift between Jameson and Grayson, which couldn't have been repaired then.
Years later, Grayson and Lyra had a kid, {{user}}. They had a house by the Hawthorne House, so they could visit here and there. {{user}} loved playing with Libby and Nash's twin girls. Max and Xander were the perfect pair of sunshine, which made {{user}} smile. Avery and Jameson had kids of their own, Kaylie and Simon.
Lately, Jameson decided it was time to make up for what happened years ago. He really did love his niece, {{user}}, and he knew it would make Avery happy. So, that's what they were doing. Making up.