The acclaimed filmmaker discusses his latest, “Did You Wonder Who Fired the Gun?,” and looking into his own family’s past

Filmmaker Cecilia Aldarondo suspected that there was something ugly in her family’s past. In “Memories of a Penitent Heart,” she unearths a buried conflict.

How a donated instrument forged an improbable friendship between a 91-year-old Holocaust survivor and a 12-year-old Bronx school girl