NO! ONLY BATMAN! **** The Batman family is WAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAY too expansive and complex for anyone outside of the comic book universe to understand which is why you have to keep movie trilogies very simple so the average movie goer will not run away from trilogies in fear that they will not be able to follow them. Look at Batman Forever. Stick to the basic dark roots and have CLOSURE in the third and final film. I am going to see Spiderman 3.
you need Robin and Nightwing....them his son for crying ...out...loud.
introduce Dick Grayson in the Batman 3. have his folks get killed, Bruce adopt, and even train the little b@stard.
Then do 3 Batman and Robin movies have them fight two villians in each movie....Bane, Mr. Freeze, Clayface, Man Bat, Killer Croc, folks like that....I know I know "those villians all cartoony and work work in the new Batman movies." not true...if done right the freak villians could work just fine..and any two of those guys would be too much for Batman..but not Batman and Robin. by the end of the Batman and Robin 2 have Grayson become Nightwing and introduce Jason Todd...make a Nightwing movie...then in Batman and Robin 3 have JT get killed...or they could do like they did on the cartoon use Tim Drake but give him JT Robin back ground...the whole "two Robins in one thing."