Confusion ?

Last week, on my son's third day of school, the teacher approached me and said that after I picked up my son, there's a lady looking for him trying to pick him up and claiming that she's the mother. Though the teacher already know that I am his mother, she said, he got picked up already by his mother. The teacher said that she just might got confused cause she's not that familiar with her students yet. I didn't ask for more details, I just reiterated to her that no one is going to pick up my son but me and my husband.