Children should never travel on two wheelers, as it is very, very unsafe. Most people, do not pay any heed to safety, or are not even thinking how dangerous it is to ferry children around on two wheelers, and this gentleman, nicely protected by his helmet (I suspect more out of fear of the law, than concerns about safety!), ferrying not one, but two kids in the rear.
There is absolutely, no protection and no restraint. Any accident (whomsoever is at fault, whether it be the rider himself, other drivers, the road or pedestrians), will result in the children being flung with great force out of the vehicle and crashing into anything that is close by. Please do yourself and your children (whom you profess to love so much!) a favor and only travel with them, properly restrained in car seats in the back of four-wheelers! Please!
Another example of dangerous pillion riding by children and their parents can be found here!