Thanks, RJ. I'm confused about the birth of this individual. An online FamilySearch tree gives Jack's birthdate as 27 October 1920 in San Bernardino County. There was, in fact, a John I. Richards born on 27 October 1921 in San Bernardino, but his mother's surname was Frost, not Saul. All records for the Richards family, including the 1920 census, have them resident in San Francisco so I would expect to find Jack's birth registered there but there is no John, Jack or J.J. Richards born in San Francisco in 1920 in the California birth index.
However, there was a Joseph C. Richards born on 2 June 1920 in San Francisco, mother's surname Saul. I am surmising that this is the child who was later known as John J. or Jack Richards. On the 1930 census, shortly before Jack's death, he was recorded with his parents and his younger siblings James and Betty; there was no child named Joseph in the household.
I don't know how to establish that Joseph C. = John J.
