i want to know how Robbins old life was.i think that vid is the answer but just to be sure....

Honestly, thet was pretty accurate. yes, he and his family had a circus act called the flying graysons, and yes a mobster killed his parents,but not the way the video portrayed it. boss Zuccos men put acid on the trapese wire so it snapped with his parents swinging from it. His original costume wasnt his trapese costume either. but ya. Batman took him in and trained him to be Robin. They became the dynamic dou for the first time in detective comics(DC)'s Batman series in 1940. oh, and Dick became robin cuz bruce understood that he would want revenge on his parents killer and helped him do it. they just kinda stuck togather ever since.
He never realy "left" Batman tho. the original titans, Robin, Kid Flash, Aqua Lad, and wonder Girl were constintly teaming up togather before they were teen titans so they decided to make a team. Robin would help the titans whenever he wasnt helping Batman. i dont think it was untill The NEW TEEN TITANS that he stpped being batmans side kick regguarly. i highly recomend that toi read TEEN TITANS:YEAR ONE par amy wolfram. its about how the team forms.Plus Robins realy cute in it!