Watch Say It Isn't So (2001) HD Full Movie Free on SolarMovie. Watch Say It Isn't So (2001) online free. Jo and Gilly date. They find out they're brother and sister. Jo moves away. Gilly finds out that he'...Jo and Gilly date. They find out they're brother and sister. Jo moves away. Gilly finds out that he's not Jo's brother and that Jo's getting married. Can he stop the wedding in time?