Banrock is an Eastern Grey Kangaroo and as the name suggests Banrock came from Banrock Station.  His mother had been caught up in a fence and as a result she broke her leg.  Her leg was so badly broken that it could not be fixed, so unfortunately she had to be euthanised. 
As a joey Banrock being a typical boy took great delight  in playing rough, but his favourite thing to do was to practice his kicking skills and he would kick anyone he could especially his little sisters Biralee and Ruby.  Now that he is older he prefers to playfight with his brothers instead and thankfully doesn't pick on his sisters so much anymore.