I had the same with the dad, after he died. What I like to think is that our MC was hallucinating the whole interaction, their mind properly fucked up from being a fucking Keeper, responsible for billions of people at college-age.
And being called the “second coming of Asteria” isn’t helping.
A complete mental breakdown is on its way, and I cannot wait 
i remember diving through the code a while ago and think i remember some of the seeing / talking to the dead parent as being tied to your mental wellbeing score being below a certain threshhold I could be mis-remembering though.
That’s a shout, though every walkthrough I’ve had, the MC’s mental health seems to be on the ropes. I don’t know whether it’s just the way I play or something, but I still want to have a mental breakdown scene for all the ages.
Oooh hell yeah, that makes a lot of sense too. Because at one point after the death, MC just woke up feeling ‘happy’ and everyone was worried because according to them, we were literally catatonic from the grief, but MC just seemed to brush everything off, and the world seems to completely go back to the norm that we’re used to from our pov. I can’t wait for the RO/friends to actually notice what’s going on then.