Hi Gadget, thank you for all your useful stuff.
Sorry I'm so bad at getting back - I only manage to go on the computer now and then so I'm a bit hit and miss!
It's all very odd then - my John Parrish doesn't seem to be the son of any of the three brothers. Wonder whose he was? As you say, it seems doubtful he would have married Mary at age 15 to make Elizabeth a second wife, but I suppose stranger things have happened.
You have the right Pamela - she was born in Chirk (and states that on censuses after 1841), but in1841 she was married to my ancestor, George Edwards, and was living in Bagillt. Interestingly, next door to them on the census is one James Parish and wife Ann, aged 30 (1841 census so no place of birth given). A cursory glance at the 1841 census doesn't seem to show a John and Mary Parrish in Bagillt however.
Pamela married George Edwards in 1839, and she died in 1858 in Bagillt.
So old John's a bit of a mystery man then!
RosemH