>after all of these years
That's the thing, though. It wasn't years to the PC. They had literally just watched their son get taken away not even a couple of minutes ago to their perception. Setting out to find their son after that isn't exactly a reaction that would be difficult to predict.
The fact that he decided to let you out of the vault, something that he probably could have done any time in the past couple of decades, as a near-deathbed curiosity is still a huge negative mark on his character.
That's the thing, though. It wasn't years to the PC. They had literally just watched their son get taken away not even a couple of minutes ago to their perception. Setting out to find their son after that isn't exactly a reaction that would be difficult to predict.
The fact that he decided to let you out of the vault, something that he probably could have done any time in the past couple of decades, as a near-deathbed curiosity is still a huge negative mark on his character.