After almost 3 months of searching for everything conceivable online that I could find on this family, I have yet to find a "Shirley B. Parsons" associated with this family.
Casey's mother's name is Shirley Stone, not Parsons. So for LE to find deposit slips, a check, and withdrawal slips within the Parsons home at Miller Chapel Rd with the name "Shirley B. Parsons" on them is extremely suspicious to me.
As far as how the family earned any income, other than Erica's checks, and selling puppies and hedgehogs, I did find a Facebook account called "Parsons Work Services" for Sandy Parsons on a landscaping business. I don't know if I'm allowed to put the Facebook link here but you can search for it on Facebook, or if you check my January 2013 timeline page, it's listed there. The date of January 8, 2013 is listed as to when the business was actually started.
The news article states that Sandy Parsons was a butcher at Food Lion in Spencer. I don't recall reading when he was employed there or why he isn't still working there, or as a butcher anywhere for that matter, if that is his trade.
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And I just wonder when "Shirley B. Parsons" came into existence. The only other conceivable person I can think of would be a daughter of CP and SP, but I don't think it's her.