Explain, using a real example, that fair does not always mean identical treatment.
Fair does not always mean everyone gets the exact same thing. Fair means everyone gets what they need to do okay.
This is a tricky idea, and it is okay if it takes some time and practice to really understand.
Mastery looks like: They can explain, using a real example, that fair does not always mean identical treatment.
Common stumbles: Insisting that fair always means "the exact same" is a genuinely hard, age-appropriate sticking point and should be expected to take repeated practice.