Chevrolet 1999 Corvette Owner's Manual page 49

CAUTION:
Never do this.
Here two children are wearing the same belt. The
belt can't 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
but the child is so small that the shoulder belt is
very close to the child'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.
yellowblue
-
shoulder belt,
1-37