I filed a chapter 13 bankruptcy in va. My father was a cosigner. the bankruptcy has now discharged and the collector is going after him.

If your father was a cosigner, then he is liable for the debt to the extent it was not paid in full in your bankruptcy case. The Chapter 13 "codebtor stay" prevented the creditor from seeking collection from your father during the pendency of your case, but now that you received your discharge, the creditor is free to seek to collect from your father. Whether or not your parents' joint assets are liable for the debt depends on the laws of the state they live in, and has nothing to do with bankruptcy law. Mark Markus has been practicing exclusively bankruptcy law in California since 1991.  He is a Certified Specialist in Bankruptcy Law by the State Bar of California Board of Legal Specialization,  AV-Rated by martindale.com, and A+ rated by the Better Business Bureau.