Game master: Okay everyone, please group yourself according to these groupings.. Oldest child or single child is group 1, middle child/in-between child is group 2, and youngest child is group 3.
Participant 1: I'm the eldest.
Participant 2: I'm the 3rd out of 4 siblings.
Participant 3: I'm the youngest in the family.
Bro Y: I'm in the middle of two.