Dear client,
The answer to your question depends on the specific terms of your grandfather's will and the settlement agreement that he made with his second son.
Generally speaking, if your grandfather's will included a clause that states that any subsequent changes to the distribution of his assets will revoke the previous will, then the entire will may be considered cancelled due to the settlement.
In that case, the distribution of the remaining 6 cents of land would depend on whether your grandfather made any further amendments to his will or made any other arrangements for the remaining land. If not, then the distribution of the remaining land would depend on the laws of inheritance in the relevant jurisdiction.
However, if the settlement agreement specifically mentioned that it was not intended to revoke the previous will or only applied to a portion of the land, then the remainder of the will may still be valid and enforceable.
It is important to consult with a lawyer or legal professional in the relevant jurisdiction to determine the specific legal implications of your grandfather's will and the settlement agreement that he made with his second son.