i
thank you, my surname is awful you second guess yourself all the time trying to work it out.Jones in Wales has got be amongst the worst. Just checking and checking and then checking again.
David Jones (b1843) does appear to be the son of Owen Jones and Margaret Roberts.
It looks as if Margaret Roberts died in 1844 and Owen subsequently married Elizabeth Roberts (nee Thomas) in 1850. David is with them in 1851 which caused by original error.
So David and Cadwalladr would have been brothers and this would explain the kinship to the Jones cousin and nephews mentioned on Owen David Jones' obituary.