motla,

It is a Trust to preserve inherited Status. The Estate of Freedom being paramount. The law of Inheritance, and the order of decent distribution of such, was handed down by God. God's Law is not commercial. God's Gifts are not taxable. Man's law is commercial. Esau sold his Birth Right. Here lies duality.

The word "Posterity" was employed to avoid naming the Heirs. To do so would have been limiting and made the instrument testamentary in nature. Also to express current condition. "to Ourselves and our Posterity" indicates possession being concurrent. Had it been testamentary, the Estate would not pass until the demise of the testator.

Any property taken under a testamentary instrument ( will ) is considered purchased. All purchase is taxable.

Some info on Deeds Testamentary : http://www.jstor.org/pss/1277805 http://www.jstor.org/pss/1068433