As far as Ken’s wife and son, Peter went to work for famed car builders Troutman and Barnes not long after his dad’s death, and has remained active in the car world ever since. He was Ivan “Ironman” Stewart’s crew chief for some time back in the 1990s. Here’s an article talking about Peter:
https://www.pajiba.com/film_reviews/...-son-peter.php
Mollie Miles is no longer with us. Here’s another link that gives some insight into her:
https://claireandjamie.com/2019/11/0...e-miles/amp/3/