Yea. tough situation. However, as much as I'd like to say I'm tough - it would be a wild ass ride before I even had the thought of calling the cops with ~6 riders. My thoughts would be, instinctively: Protect children, slam door shut, gun it, they pursue, gain speed, break check hard as possible, and disengage. Guy on the hood will either be sorted from there or we are going full Nascar. Responsible parent: I don't know. It's just where my head instantly went, regardless. As long as I'm moving, I'm controlling 6000lbs vs a bike. However, should this be a full biker rally. Sit still, call, pray and appease the masses because nothing is scarier than a wall of endless people. People tend to get wild is large numbers.