code: public Person getMother() {
          if (!isSet()) {
              return new Person();
          }
          final Person mother = (Person) find(getToString());
          if (mother == null) {
              return new Person();
          } else {
              return mother;
          }
      }
docs: Get the person that this object points to. If not found return an unset
  Person.
  
  @return the mother.