What does a child saying '0' indicate about their height relative to others?

If a child sees 3 children taller in front of them, what number do they call out?

A child reports seeing 2 taller children in front. If their height is greater than one in front, what is their position likely?

If one child sees 1 taller child and another sees 3, where might they be positioned relative to each other?

How many children must be shorter if a child sees 4 taller in front of them?