A year ago I saw a similar thing except we went to a house to pick up a purchase. Who met us out the front was a girl about 6 with a baby on her hip and 2 younger siblings. Their mother was no where in sight. The little girl took us in to part of the house to get the item and I asked her where her mother was so I could pay her and she told me it was fine to give her the money. Then she proceeded to tell her little siblings off for being naughty and told them to go play.
I heard some noise inside and a few other things and realised the mother was inside but she wouldnt come out. Instead leaving her 4 children to deal with complete strangers.
Once the item was in our car we heard the mother scream out for her to go inside.
It was such a bizarre experience.
So I think I would find a child holding a baby with no parent insight a bit odd.