I pursued this John Symon and Georgina Chisolm marriage and unfortunately this isn't my John Symon - his father is John Symon - possibly the John Symon mentioned in LibIndx, where I'd expect mine to be John Young or blank and Margaret Symon on the marriage certificate.
I discovered a fifth child born in 1985 and died in 1900 who didn't have a Kirk Session entry either.
So I am back to scratching my head over this generation.