Answer:
The nieces, because a deed is prima facie valid absent evidence to the contrary
Step-by-step explanation:
According to Wikipedia definition, A deed (anciently "an evidence") is any legal instrument in writing which passes, affirms or confirms an interest, right, or property and that is signed, attested, delivered, and in some jurisdictions, sealed. It is commonly associated with transferring (conveyancing) title to property.
For the fact that the man in question gave a verbally and legal request which was executed and officially endorsed apprpriately, the subsequent action taken is null and void.
There should be a copy filed with the court where the deed is signed and attested. That particular copy validates that the nieces of the man is entitled to those parcel of land.