Updating fields from another table

Here is my situation. I have a featureclass that has a few attribute fields that I need to update from an Access database. I have an OLE Database connection set up, but I also have a copy of the specific Access table in the geodatabase in a relationshipclass with that FC I want to update (I have a model that replaces that table periodically). The Access data is routinely updated by other individuals. I would like to come up with a script/model that will update the fields in question for each feature. The Access database will have some entries that will not have a corresponding feature in the FC, so they should be left out. I have taken one python class and it seems maybe a cursor might be used, but I’m not sure how to approach it.

Any help is appreciated.