Being grandfathered usually will also be the term used to allow things to continue if they have been done as an exception. The best example would be a variance in construction. If you get a variance allowing you to be closer to a lot line than code and then the add a rule to the code that says no more variances for that close, you would be grandfathered in. The same thin should apply if you get an approval to park a B in the driveway, which was Rodger's example, from the HOA, as an exception, they shouldn't be able to recind that later. Of course a lot of HOA's are run by wannabe bosses and kings, so it can get a little out of hand.
