code: @Override
      public void visit(final Wife wife) {
          this.wifeFound = wife;
          if (wife.isSet()) {
              mother = wife.getMother();
              spouses.add(mother);
          }
      }
docs: Visit a Wife. We track this and, if set, the Person who is the
  mother.
  
  @see GedObjectVisitor#visit(Wife)