This kind of reminds me of this one time my friend and I were at McDonald's having a coffee and a pretty quiet and serious discussion about something that happened to her at the time. There was little girl, probably about 4 actually, who came over to our table to talk...so we smiled at her and said hi.
Not even a minute later she's back again, standing there staring at us. So we kind of smile again but go back to our conversation. Then, she talked to us again. By now I am looking around wondering who her parents are and I see this woman absolutely beaming with pride looking over at her little daughter. I give the mom a tight smile and then continue to ignore the girl while my friend and I lower our voices even more and have our talk.
She stared for a long time and we ignored her, until finally I couldn't take it anymore and I said, "excuse me but we are trying to have a private discussion, okay? Maybe you should go sit with your mommy."
The mother came over to get her daughter, shooting daggers at us the whole time, and I heard her say, "don't worry baby, some people are so rude."
Apparently we were rude because we did not want our break to be dominated by some random kid.
And I said it in a nice way, not a rude way at all!! But I guess nothing less than ooohhing and ahhhing over her child would do for her.