Ive been looking for this for a while with no luck. It was the early days of netflix and it had a big family having a reunion and at the end of the episode the elderly father of the family is found dead at the bottom of a cliff near the house and they think he killed himself though its hinted otherwise. Ringing any bells for anyone?  

I swear it was a Kdrama but I will say im not 100% as for the year I unfortunately dont remember.

Graceful Family?
Chip In?

In this list you can find all the original Korean Netflix productions. It does not seem to appear something like the one you describe.
https://it.mydramalist.com/list/47a6w2JL

Can you try to remember something else, one actor, actress or some special thing of the series?

 LouM:

Graceful Family?
Chip In?

Both of those weren't it I'm afraid.