His son Cristian is a Barça fan
AS Roma's captain and legend Francesco Totti has been at Barcelona last weekend, as reported by Mundo Deportivo. He keeps a good relationship with Barça's manager Luis Enrique (who coaches Roma a few years ago), but they didn't met.
One of the reasons of Totti's family visit to Barcelona was being able to visit the Camp Nou and the Barça museum. Cristian Totti, Francesco's son, is a Barça and Leo Messi fan. In fact the whole family took a picture next to the Champions League trophy (one award Totti hasn't won with Roma!), because Cristian asked to do it.