I'd been looking for Margaret's family, found a possible family & then realised they were sharing a house with Daniel & Margaret in 1861.
1861 3 Napier's St, Mountain Ash RG9/4048 folio 4 pg 1
Mary Richards head widow 53 sinker's widow b. Aberdare
Elizabeth dau 18 b. Aberdare
Jenkin R son 12 blacksmith b. Aberdare
Catherin dau 8
1851 Mountain Ash HO107/2460 folio 111 pg 1
Thomas Richards head mar coalpit sinker b. Aberdare
Mary wife 42 b. Aberdare
Margaret dau 19 b. Merthyr
Ann dau 17 b. Merthyr
Elizabeth dau 8 b. Merthyr
Jenkin son 2 b. Aberdare
Catherine dau 1 month b. Aberdare
John Beynon lodger 22 collier lab b. Breconshire, Defynnog
1841 Pen Wain Fawr, Merthyr Tydfil HO107/1415/7 folio 27 pg 7
Thos Richards 30 sinker
Mary 32
Margaret 10
Ann 7
//
Margaret Richards 66
Mary 34
all born in county
birth reg Jenkin Richards jun qtr 1849 Merthyr Tydfil vol 20 pg 443 mmn Meyrick
Marriage in the parish church of Merthyr Tydfil 5 July 1830 for Thomas Richards & Mary Meirick, both marked.
Possible death reg for Thomas Richards age 50 dec qtr 1860 Merthyr Tydfil vol 11a pg 152.
Inquest into his death
https://newspapers.library.wales/view/3381492/3381499/39/