The FairTax Rebate is also uniform and allows for the FairTax rate to be applied uniformly above a certain amount of spending, hence constitutional.That's not at all true.
Go to their own rebate chart and you'll see that a family of four, husband and wife with 2 kids will receive MORE than a family of four with a single mom and 3 kids.
The Fairtax is a fraud beginning with the way the rate is being sold.
You are wrong, it is uniform.
http://www.fairtax.org/PDF/PrebateExplained2012.pdf
Each qualifying adult is rebated $11,170 and each qualifying child is rebated $3960.
That is uniform.
What you are referring to is whether the FairTax is fair. It is as fair as any tax system can be. A divorced custodial parent of 3 will likely have income from a non-custodial parent or in the case of a widowed parent will have social security.
But the discussion is bout its constitutionality and it is uniformly applied, therefore constitutional.