Carla, our son said exactly this last year, and my mother heard it on a video call. She was quiet for a moment and then said, "Good, it means you did it right." I think grandparents understand more than we fear. What changed for us is that we stopped talking about "going back one day" as a vague plan, because it was clear the children had already answered that question.
Something happened last week that I'm still thinking about. We were talking about the summer holidays in Italy, and my youngest said, "When we go home, I mean to Austria." Home. She's lived here for three years, and that's where home is now.
I felt proud and sad at the same time. My parents in Italy would be heartbroken if they heard it. For parents whose kids started calling the new country home: how did you feel, and did it change anything about your plans?