Some lady asked me to take a photo of us and I was wondering why...

Was at the park with my two daughters and a friend and my friend's two daughters and we were on the swings and suddenly this lady was on the swings and was saying how her baby is also my age (7 months) and talking about how her baby is 7 months old and how the baby was daddy's little baby girl and she was like "And what is yours?" And I was like "Umm it's a boy" and then we kept talking and then she was like "Can you take a photo of us?" And I was like "Yeah why not" and then she took out a big camera and took a photo of us and I was like... (I'm not big into taking photos so I'm not used to this)