Don't worry about sounding petty. Your guests are not likely to be reading your reviews that you have left other guests. And if they do read it, and think you are "petty" for being upset that guests steal...then you dodged another bullet.
Just be damn sure you know for a fact that the guests cooked the eggs, and it wasn't anyone else in your household. Also, keep in mind the guest may respond to your review. So when writing your review...try to cover anything in case they respond with lies. This is what I would write:
"XXXX and her husband stayed with me for XXX nights. They were friendly to interact with; however, I was a bit disappointed that they disregarded my house rule of "fill in the blank about extra guests." I admit that I did not confront them the first time they invited their daughter over, as I assumed it was just a one time event and the daughter is very pleasant to be around. So this was not really an issue....at first.
However, they continued to invite the daughter over for the remainder of the stay. And still this was not an issue with me, as I got along well with this family. I only began to feel taken advantage of when I discovered the daughter was not just "visiting," but showered in the bathroom. Only paying guests should be using the shower, etc.
I also clearly communicate what items I offer guests to eat for breakfast, and I have a house rule of no cooking in the kitchen. On the last morning of their stay, I returned home to discover that some of my personal food was cooked."