Performativity of children in spaces of play

Hi I am looking to conduct research for my dissertation covertly observing children in spaces of play e.g. summer camp where I will work, along side other spaces such as parks, bowling alleys etc. I currently have two younger siblings who I will bring with me into these spaces to allow me to gain access without looking suspicious. I am worried about the ethical implications of my research, I hope to observe different behaviors of children noting down my findings in a fieldwork notebook. However, like I said I wish to observe covertly, and hence will not be gaining consent from children or their parents. I will not be using names, ages etc, merely note taking on things that I see in this natural environment. Any advice would be great, thanks.