The concious misconceptions would be stronger than the subconscious awareness. So it might shine through, but would be more in line what the person would be expecting.

As long as the death still had some effect on the person (which in the case of a parent dying is still present) they can see them.

The characters can catch the Basculin/Basculegion (and after the event they'll be available in the wild) but doing so will have no effect on seeing spirits.