OK so starts there's a young hippy family driving in their old flowerpower painted van somewhere in a big city(maebe new-york) I think they pickup a hitch-hiker or maebe see something their not supposed to and end up getting ambushed,shot&killed by thugs... their very young son somehow survives and takes to the streets growing to be a modern-day kind of reclusive
Tarzan type superhero that lives in his(reminiscent) psychedelic-graffitti squat/hideout somewhere the city which he swings down from armed with a crossbow and helping fight crime... to avenge the killing of his parents?. something like so anyway, thanks!

High I think this film is called wild thing or wild child

High this film is called wild thing or wild child