When I was taking a lesson, I had already knew what son, ses, and sa meant. They means his/her. This depends on the gender of the object you are talking about. When I was doing a question, it said to translate "je comprends ses enfants." I translated to "I understand his children." it counted this as wrong. It said it was supposed to be "I understand her children." Is there something I am missing, or is this just a mistake?