Quote Originally Posted by Kish View Post
You don't see that asserting that Roy's afterlife destination was never dependent on his trying to fulfill the oath, requires that "Your son is getting in because he died in the process of attempting to fulfill the oath" is a lie? Huh.
I don't see that as a lie.
Keeping his word by attempting to fulfill an oath that somebody else made out a sense of responsibility for his father's mistakes is Lawful, especially if it gets to the point of dying out of this sense of responsibility.
Quote Originally Posted by Lawful
Lawful characters tell the truth, keep their word, respect authority, honor tradition, and judge those who fall short of their duties.
[...]
“Law” implies honor, trustworthiness, obedience to authority, and reliability. On the downside, lawfulness can include close-mindedness, reactionary adherence to tradition, judgmentalness, and a lack of adaptability. Those who consciously promote lawfulness say that only lawful behavior creates a society in which people can depend on each other and make the right decisions in full confidence that others will act as they should.
Bolded are the relevant parts.

Trying to fulfill an oath because it helps him save the world from an Evil world-domination type who murders out of boredom, and also because someone Roy dislikes is kept out of eternal rest until the oath is fulfilled, is Good, especially if it reaches the point of dying in attempt to save the world and the population of a city.
Quote Originally Posted by Good
Good characters and creatures protect innocent life.

“Good” implies altruism, respect for life, and a concern for the dignity of sentient beings. Good characters make personal sacrifices to help others.
Bolded are the relevant parts.

"Your son is getting in because he died in the process of attempting to fulfill the oath" is not a lie because Roy attempting to fulfill this oath is both a Good and a Lawful thing. The Celestial already made a case that Roy could have easily been put in another afterlife, but his dying act (attempting to fulfill the oath) was incredibly Good and Lawful, and that was what secured his spot in Celestia. It's not a lie if it's completely true.