Philadelphia City Treasurer Nancy Winkler and her husband, John Bryan, of Philadelphia, are suing over the death of their 24-year-old daughter.
Aspiring artist Anne Bryan and her friend died in the rubble of a Salvation Army thrift store as they shopped June 5.
The family's lawsuit says the Salvation Army and the adjacent property owner knew the demolition posed a danger to the small store.
The lawsuit faults the Salvation Army for keeping the store open, and the building owner and two contractors for undertaking a risky demolition plan.
Earlier Tuesday, a judge declined to reduce bail for contractor Sean Benschop, charged with six counts of involuntary manslaughter.