Legalapproach: Your father was unlucky the missing oil cap caused a fire at that late stage on takeoff, my similar event had a different result.
In my case there was a bloody great bang in the starboard engine on takeoff just after I let the brakes off, so I was able to stop and vacate.
One thing still puzzles me, as I ran clear of the smoke my nav was well ahead of me and going away, how he got there I shall never know because I was the one who opened the canopy !