Mount Elizabeth morgue?
I am familiar with that place. I worked at the lab there (histology department) and had visit the morgue together with the attendance, since he was the one with the key.
The journey to the morgue has a long passage way. Inside looks empty except for those storage and fridge which, when opened, contained body parts (depending on that day of surgery). One time, I saw a huge piece of obese leg and right away knew, without seeing the tag label, that patient must have an incredibly unhealthy diet. There are other room inside, and that Mount E is popular with one thing- it's sad that such a surgery is carried out there more often than other government hospitals. But I guess with money, it can be done discreetly.
There is no ghost or sightings as your relative claimed. Every thing at Mount E is clinically clean. Plus the kitchen is not near the morgue. Also, the attendance of the morgue was a young tall fit athletic man. His physique demands him to carry speciments from the lab to the morgue. Sometimes, I carried too. So to have an elderly man as a morgue attendant, as you claimed your relative saw, is impossible.
Finally to further clarify, as a former Mount E staff, I have sometimes stayed for work past 7pm, when the sunset, still I did not see any ghost at the lab or in the morgue.