OK,I have been looking and typing random names into Google all night without luck.
Im pretty sure this movie was released in the 80’s,it was about a bunch of kids aged from around 5 to 17.
The movie was situated in an Orphange,there was a lot of pranks being played out,I seem to remember a lot of water balloons being dropped from high balconies
The movie was comedy with a serious side and message.
I know its not a lot to go on,just hoping one of you has a real good memory.