Sorry forgot to add this:
What did you do after you got this photo? Did you tell them? Did you show them? Or did you just walk away and they don't know they were photographed.
Sorry for the forward questions just curious about street photography.
They are actually my wife and daughter. lol
We went downtown for a mini christmas session and when we were done, I was walking to grab some more gear and then saw them playing. So I decided it would make a great family photo.
Usually I will take a candid photo of an individual and show them. most of the time they are ok with it, and ask if I can forward it to them. I always provide them with a business card so they can email me, and I will email them the final edited photo without printing rights. I have only needed a model release form on some occassions.