A small Asian child rides on the back of a woman who is wearing a hat.
A mother and her child ride home from work.
Just because a child is riding on the back of a woman doesn't mean that woman is their mother, and doesn't mean that they ride home from work.
A mother and her child are not necessarily always together. The woman could have been riding to and from any locations, not just home from work.
A woman and child don't imply they are mother and her child.The fact that a child rides on the back a woman doesn't imply that they are going home from work.