From the Right Result Wrong Reasoning department:
Before diving headfirst into the humor, a quick review of probate law. Because nothing helps a joke along like a couple paragraphs about how the legal system handles arguments over dead people's money.
Undue influence is a thing because Sometimes people create a will that they don't really want. For example, they make make a will because their caretaker pressures them to write a will in favor of the caretaker. Undue influence requires (1) a confidential relationship, and (2) suspicious circumstances. A confidential relationship can be shown by the person depending on the caretaker while being isolated with them. Suspicious circumstances is more nebulous, and is, broadly speaking, anything that makes the trial court go, "Dun, dun, dun!"
With that in mind, let's look at this case: Decedent (legalese for "the dead guy") married a second wife in 1990. When he died in 2016, he had written a series of recent wills that ended up giving most of his assets to his second wife, who (reading in between the lines) was also his caretaker.
However, there was voluminous evidence that Decedent knew what he was doing each time he changed his will and that it was his own free choice. (Holy crap, there was evidence: Even the summary was long. Defendant's attorney did a good job here.)
This brings us to the trial court's analysis of undue influence, which, for those of you inclined towards sleep right how, is the humorous part:
The judge explained "[n]one of the evidence presented to the [c]ourt demonstrates that the character of the relationship between Stuart and Amelia was any different than one would expect from any other marriage of some period of time–this was over [twenty] years[.]" The judge found "the actions between Stuart and Amelia, most especially over the last four or five years of the relationship [prior to] Stuart's death, just evidences to the [c]ourt a natural [marital] relationship. The actions taken by Amelia did not demonstrate to the [c]ourt any confidential relationship."
[Emphasis added.]
Hold up folks! She was his caretaker! She wheeled him around in his old man wheelchair! If he ever drooled, she wiped his old man drool! Those Venn diagrams ('wife' and 'confidential relationship') frequently overlap!
So now you can see why the plaintiff appealed this case. There was obviously a confidential relationship!
But you can also see why the Appellate Division responded with, 'Meh, affirmed,' rather than correct the trial court's reasoning: The trial court's point is clear in context.