The late comedian's only child said that losing her L.A. home ... referring to her late mother Joan Rivers, who died in 2014, and father Edgar Rosenberg, who died in 1987. "To be 100% honest ...

But her mother Joan Rivers' famous collection of jokes ... "It's not just my life, but my son Cooper's life too. We were both only children, and just all of it is gone." She says it's surreal ...