I am in the process of filling out my security clearance form (not the ERC), the one where you have to list residences and employment for the last 10 years. I run into a few problems. My father's birth date for one. I tried asking my mom, but they have been divorced for 25 years and she doesn't remember, and forget about trying to find out where he is employed, for all I know, he could be deceased. It also asks for stepparents, does that include "ex"-stepparents (no longer married)? I also have a half sister that my mom gave up for adoption and has no contact with and no means of contact.
Jobsite address is another difficulty. In my line of work in the oilfield, we changed jobsites every month, and it says that it may be different than employer's address. I have also had different supervisors for each jobsite. For some previous jobs I don't have the full name or phone number of supervisors. At least the residences will be fairly easy, but have to try and remember specific addresses from more than 5 years ago.