funny that I even see and heard

The funny happened is at the work, only me and another woman. we are cashier in the front. Her mane is Li Ly, she is married and she had a son. Today a man with his child went to our Chinese supermarket and he was going to pay for food. His child called Li Ly mom she and he both felt embarrass. He told his son to stop called her mom because a child wasn't Li Ly son. A child hit his father. I was laugh them because I though it is funny ever. I asked her why a child didn't call me mom. She told that I didn't look like mom.