Paint balling for children

Hi Tia, I wouldn't recommend paint ball as suitable for this age group those pellets fly quite hard and can cause bad bruising plus at that age they don't always listen to safety advice about not shooting people above the neck. Maybe laser tag might be a safer option there used to be at Crosley bowling in town. Not sure if there still,my kids are older now

http://lepaintball.be/
Not a personal recommendation, just a place I have passed a few times.

Another option is to go to Legenturia in Zaventem. a new indoor playground with bouncy castles, laser shoot, bowling. Friendly multilingual personnel en many party options.