What can i do and how do i stop it??

We all came here from somewhere.... at least one of our family members did. I wish I knew your age because it sounds as if the two of you are pretty young and the saddest part is that these kids saying this to her don't mean it , they hear the adults that they are around saying it and just repeat what they hear . You just keep standing by your cousin and reure her that not all Americans are this ignorant. Also tell her I said " Welcome to America " Good luck.