Although some of the instruments were saturated by the unexpected yield of the reaction, I did persuade my father to walk steadily towards the vortex. The laboratory timepiece read: 2004, December, Monday 13th, 15:27:07.637 and before the timer’s milliseconds reached 750, Alan arrived in 1929 with a migraine headache and a tremendous thirst.
Having reset the instruments and stabilised the power supplies, I arrived in 1929 a few days later. Alan and I met up and decided to drive to granny Betty’s house but the car wasn’t up to the job. Unfortunately, we crashed into a fence at speed and, sadly, Alan was killed outright.
Betty had been a nurse at the hospital for some time and after a few weeks in intensive and ward care, I was transferred from the hospital to Betty’s house to recuperate. I soon fell for Betty, proposed marriage and we produced a son, Alan, in April 1930.
The 1930s were mostly excellent but, as a result of another road traffic accident, I died just after the end of World War II. Betty and Alan lived relatively comfortably through a few post war years.
Betty died in 1952; Alan met and married my mother in 1953 and I was born five years later.
The grandfather paradox of backwards time travel, resolved again*.
* See also: https://arxiv.org/pdf/1609.08470v1.pdf
Local symmetries allowed 