I would hope after the official diagnosis is told to family /friends, most would look up info so you don't have to repeat the PD basics over and over...
A good link or 2 or a printout for those that don't go online much..

Part of it depends on how bothersome/severe your symptoms are .. your PD may not become the worse case scenario as often read about online..so why stress family out ahead of time if it may not progress to that level for many many years..

And, some will stick their head in the sand and not want to know much at all about it.
Just the way they are..