Despite living in the shadow of her superstar younger brother, John, actress Joan Cusack carved out a substantial career with memorable supporting roles. But unlike her better known sibling, Cusack earned an Academy Award nomination for her performance in “Working Girl” (1988), which came hot on the heels of her breakout role in “Broadcast News” (1987). From there, she accumulated a long list of credits where she played the best friend, sidekick or scourge, most notably in “Say Anything” (1989), “My Blue Heaven” (1990) and “Addams Family Values” (1993). While she did land the occasional