Hi list I also have fostered ancestors. David and Elizabeth EVANS [ both aged 25] of Little House Colva & their 3 children Elizabeth,John & Reese were found on the 1841 census. But no trace on the 1851 census anywhere in Wales but there is a 12 year old Elizabeth EVANS born Colva working as a servant on a farm in Llanfihangel Nant-Melan which fits. Also there is a 'foster child' named Rees EVANS living with a Thomas & Mary WILLIAMS in Upper Ffynonny in Colva, but Rees's age is given as 5. This could be a transcription error as Rees would be 11. Or perhaps, as the WILLIAMS were fostering, the age may have been rounded down on purpose or because the parish did not know his age, as a child under 8 would be helped by the parish. A very loose subject this fostering. My grandmother was fostered back in 1876 and by the 1901 census she was married, her husband was named as 'head' & living with them were her foster parents John & Dinah RENDLE named as ' father in law & mother in law.