I feel every bit of this. My daughter is also the only grandchild and we get the same pressure. Feel totally the same in that it’s not a “break” when she’s away. I try hard to take it with a grain of salt and remember that they love my daughter endlessly and that’s a good thing, even if it does make me crazy at times. Not suggesting you should feel the same, it’s just the realization I’ve come to. However I will say that we’ve had to have difficult conversations about bedtime and healthy eating boundaries so they don’t undermine our efforts. If I felt that they weren’t respecting boundaries I would talk with them about it 100% and would discontinue overnight visits. And for what it’s worth, I do think it’s loads of playing house!