1997 GMC Safari Owner's Manual - Page 71

Never do this. Here two children are wearing the same belt. The belt can't properly spread theimpact forces. In a crash, thetwo children can be crushed together and seriously injured. A belt must be used by only one person at a time. a child is Q= What ifchild issowearing a lap-shoulder belt, is small that the shoulderbelt but the very close to thechild's face or neck? A: Move the child toward the center of the vehicle, but be sure that the shoulder belt still is on the child's shoulder, so that in a crash the child's upper body would have the restraint that belts provide. If the child is sitting in a rear seat outside position, see "Rear Safety Belt Comfort Guides" in the Index. If the child is so small that the shoulderbelt is still very close to the child's face or neck, you might want to place the child in a seat that has a lap belt, if your vehicle has one.