My last remaining uncle died last week, aged 95.  His daughter views my tree on Ancestry as an invited guest, and I waited until after his funeral to add my uncle's death details (he died in Canada), so that I could be sure that it wouldn't come as a shock to anyone.  My cousin saw her father's details on my tree, and she immediately emailed me - to tell me that I'd got his place of death wrong !  

Both my mum and dad were dead long before I started doing my tree research, so I'm not sure how I'd feel in your position.  I can only speculate that the loss is going to hurt anyway, so maybe it's best to get it out in the open and done with ?  Only speculation, though  
