Batman is known to be the most socially disconnected superhero in the entire comic cosmos, but in actuality he has the largest set of family members (sidekicks). Quite strange? Well our Dark Knight is quite a strange vigilante after all. Lets have a quick look at them:
1) Dick Grayson- One of the first Robin's to the Batman, Dick was a part of his acrobatic family performers known as the"Flying Grayson's". At a young age he witnessed a mafia boss take down his parents (to extort & threaten the circus out of money). Batman then takes him in as a legal ward and thus begins the journey of Batman & Robin. Dick later moves out the shadow of Bruce and goes on to take the identity of "Nightwing" and fights for justice in a district called "Blüdhaven"
2) Jason Todd- The second reincarnation of Robin in the comics, his storyline is very similar to Dick Grayson, in terms of his origin (DC did not want to step away from the character development of the previous Robin). He is later killed off in "A Death in the Family" story & later brought back to life as the anti-hero "RedHood" (comics) & Arkham Knight (video games)
3) Batgirl- This mantle was taken up by Batman's most trusted ally, Commissioner Jim Gordan's daughter Ms Barbara Gordan. She had quite a brief run before being shot by "The Joker" in "The Killing Joke" comic & that sealed her fate to become one of the most powerful allies to Batman known as Oracle (She is his trusted technological aid while fighting crime).
4) Lucius Fox- If this guy would not head the Wayne R&D department, Bruce would be having some real tough time in the "procurement" department. The brains behind all the gadgetry, automobiles, cape (memory cloth, remember?), cowl and the works. He is the brain behind them all. Hell, I think he is the brains behind the entire ultra-cool Bat-cave setup (Let us know in the comment)
5) Alfred Pennyworth- Who can forget the trusty Wayne family butler? Alfred has seen Bruce become the symbol of hope known as The Batman and has seen the Dark Knight through some of his darkest moments. Some story arcs have actually mentioned his "Secret Service" background and these skills are always used for the greater good of our her, Batman.