Katherine smiled a bit more brightly than she usually would. Kind words from her grandmother would always mean the world to her. Besides, Tony seemed surprisingly fine with her heritage. It was a relief.
"Thanks, grandma," she said. Her smile got a little bit more brighter. "It's quite easy to suddenly go from just having children to being a great grandparent in this place. Time travel, alternative timelines and stuff. The timeline I was born in will never exist for the people here." It was as much of an explanation as it was a preparation for the surprises that waited for Tony.