[Avodah] implicit mechila post death

[Rich, Joel]

We generally hold that mechila (waiver) granted by an individual (e.g., parent for child honor issue) continues unless specifically revoked. We also have a concept of it being a mitzvah to listen to the command of the niftar. Question: What if, in retrospect, one believes the niftar would have changed his mind had he fully understood the implications of his waiver. Should one still honor the waiver/request? Even prior to ptirah, if the individual cannot make his own decisions, do we follow his last wish in a similar case?
KT
Joel Rich

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