public IHttpActionResult DeleteParentFromStudent(string id, string parentId)
 {
     if (studentsService.ExistsID(id) == false || parentsService.ExistsID(parentId) == false)
     {
         return(NotFound());
     }
     if (studentsService.StudentHasParent(id, parentId) == false)
     {
         return(BadRequest("Student does not have that parent in his parent list"));
     }
     return(Ok(studentsService.DeleteParentFromStudent(id, parentId)));
 }