Hi, It is most important that you post all information from any known census records. This family was mistranscribed in 1871 and almost impossible to find on your original information.
Here goes.......
1871
No address recorded. Living Eglwysilan Glamorgan
Daniel Llewellyn 1831 Llanwonno, Glamorgan, Wales Head Wood Cutter
Ann 1831 Merthyr-Tydfil, Glamorgan, Wales Wife
Daniel 1869 Merthyr-Tydfil, Glamorgan, Wales Son
Evan 1858 Merthyr-Tydfil, Glamorgan, Wales Son Wood Cutter
Jemina 1856 Merthyr-Tydfil, Glamorgan, Wales Daughter
Mary Ann 1867 Merthyr-Tydfil, Glamorgan, Wales Daughter
William 1860 Merthyr-Tydfil, Glamorgan, Wales Son
Transcribed on the Index as Llewsllin
This census entry is very difficult to read so I would take Daniel's birthplace with a pinch of salt!!!!
RG10/5374 Pontypridd Folio 91 Page 23
Tricia