His eldest is with Bail Organa in the huge hallway as part of the greeting party for Obi-Wan and Anakin.
His second daughter has speaking lines, and is the fat blue thing during the Alliance meetings at Padme's place.
His son is the young Jedi on the landing platform that Bail is on that takes out a few Clone troopers before he is shot in the chest.
(And that all of his Kids were in the other two movies too. Again, a few with speaking lines.)