It’s been 50 years since John List killed his entire family in their Westfield mansion and disappeared to reinvent himself. But the shocking mass murder is still on the minds of many in New Jersey and beyond, as thousands of listeners are diving into the story with NJ Advance Media’s new serial podcast, “Father Wants Us Dead.” With over 20,000 downloads in five days, “Father Wants Us Dead” peaked at No. 91 on Apple Podcasts’ top podcasts chart and No. 23 among true crime podcasts. The first three episodes of the investigative true crime story were released May 10, and a new episode will be ava…