I'm pretty certain the 1851 household of Richard and Catherine Evan(s) below contains my ancestors and 2 of their children.
Glamorgan 1851 -- Class: HO107; Piece: 2456; Folio: 168; Page: 3
Residence: Pleasant Hill
Richard Evans 67, born Bridgewater, Somerset
Catherine Evan 63, born Llantrisant, Glamorgan
William Evan 30, born St Brides-s-Ely
Richard Evan 25, born St Brides-s-Ely [possibly died 1864, bur. St Brides-s-Ely]
John Evans, my ancestor, is not listed. He was already away from home -- married in 1855 in Radyr.
Richard and Catherine Evan(s) were married at St Brides-s-Ely Parish Church in 1814. He was "of St Fagans"; she was of St Brides-s-Ely. They are both buried in the St Brides-s-Ely Church Yard.
In 1861, the couple were living alone in the St Brides-s-Ely village. Richard said he was born at St Fagans, Glam; Catherine at Llanblethian, Glam.
I have not located Richard and Catherine Evan(s) in 1841.
I've even gone so far as to search for people who listed their birth places as St Brides-s-Ely in 1861, 1871, 1881, 1891, 1901, and 1911 Censuses, hoping to find my Evanses.
The St Brides-s-Ely Parish Registers show two likely additional children, though my John and the William born about 1821 are not in the Parish Registers for the village:
Name: Mary Evan
baptised 30 Aug 1818
Name: Evan Evan
baptised 13 Apr 1823
I've been to the village of St Brides-s-Ely a few times and done a location study, hoping to trace these folks, especially finding descendants of William and Richard (and any other children). The elderly individuals I met on my trips to seemed to believe all the Evan(s) residents of the village in their lifetimes were somehow connected. Most prominent in everyone's mind seemed to be former Evans residents of the house named Ty Coch.
Everyone knows Evan(s) is difficult to trace, especially when you're working from the U. S. instead of South Wales.
If anyone else is searching for my Evanses or has tips, I'd be grateful for comments.