GMC 2005 Canyon Owner's Manual page 39

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.
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 rear outside seat position,
move the child toward the center of the vehicle.
See Rear Safety Belt Comfort Guides for Children
and Small Adults on page 1-29. If the child is
sitting in the center rear seat of a crew cab, 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.
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