uglymugly, with any imagination, it does.
The op has two healthy sets of grandparents for her child, both of whom wants to spend time with their grandchildren, and who are able and willing to have them overnight. FGS, having just ONE bedroom is not an issue, it is preciousness and lack of imagination. Who says that a visiting grandchild needs their own bedroom? If the op had not been favouring her own parents time with her kids, the mil might not feel the need to point out this difference.
The op needs to be able to manage the situation and try and divide the time equally between the grandparents. It is neither about scoring points, nor about fighting over a grandchild like it is a trophy, but about recognizing that the children have two sets of grandparents, and it is in their childrens interest to build a relationship with them both.
Walk a mile in MY shoes, where you have not only small kids and no grandparents to leave them with, or to baby sit, or spend the night with, but where you actually have to care for elderly parents too. On top of work, then you might look at your own situation in a different light. Grandparents are a resource, you just have to manage it, and appreciate it.
And you ARE comparing, and finding your inlaws lacking, when you make a point that YOUR parents made a bedroom especially for your kids, but your inlaws have only one bedroom, and you are planning on using this against your inlaws to explain why they cant have your kids. This will end in disaster, and you have only yourself to blame.