My GC all live at some distance from us. Our smallest spare room is hot pink, with bunk beds, Polly Pockets, Barbies, spare pants and so on. We have 3 grand daughters, 6, 8, and 16 and it is still referred to by the younger ones as "Poppy's room". (She is the much admired 16 year old cousin of the other two.)
And she insists it is hers too, while quite happy for the littlies to share it.
DGS has another spare room, which is not pink, but he thinks of it as his.
And as I have been decluttering, I have been stopped in my tracks by "Nannie, where are the bunnies that always live on my bookshelf?" (Bunnies quickly retrieved from charity bag!)
Now that we are moving "Nannie, what will my room be like?"
So for them it is a given, but they don't live down the road. Nevertheless, I think it is practical and rather lovely for GC, no matter where they live, to have another place where they feel totally secure. And where better than at GPs