How to get entity(entitlement info) from child table on insert/delete action

Hello,

I am looking to create a custom process task that writes entitlement information out to a file on the insert/delete/update of a child table.  I have looked at the api's involved and the data available to the process task but I cannot find how to drill down to get the entity data related to the action thats taking place.   What would be the best way to get to this information?  I'm not concerned as much about insert(because I can just grab the newest entitlement by date/time)  but how can I get the information if the entitlement has already been deleted