This Doctor believes there are some bad genes in the lineage. He also thinks that Elvis had Ehlers Danlos syndrome. There are some times in his movies I have to wonder when you see the way he bends his thumbs https://www.practicalpainmanagement.com/pain/other/brain-injury/elvis-presley-head-trauma-autoimmunity-pain-early-death
people with Ehlers Danlos syndrome usually die of heart issues IIRC....had a co worker who’s grandchildren all have it...