Pontiac 2007 G5 Owner's Manual page 40

CAUTION:
{
Never do this.
Here two children are wearing the same
belt. The belt can not properly spread the
impact forces. In a crash, the two children
can be crushed together and seriously
injured. A belt must be used by only
one person at a time.
40
Q:
What if a child is wearing a lap-shoulder
belt, but the child is so small that the
shoulder belt is very close to the child's
face or neck?
A:
If the child is sitting in a seat next to a
window, move the child toward the center
of the vehicle. Also see Rear Safety Belt
Comfort Guides on page 35. If the child is
sitting in the center rear seat passenger
position, move the child toward the safety
belt buckle. In either case, 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.