Chevrolet 2007 Express 2007 Express Owner's Manual page 42

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.
42
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 seated in a rear outside seat
position, move the child toward the center
of the vehicle. Also see Rear Safety Belt
Comfort Guides on page 37. If the child is
sitting in the second row center seat 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. If the child
is so small that the shoulder belt 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.