Hi,
Don't know if it's the same but I also found I think the same, 1861 Margaret Morgan, married 50
abt. 1811 living alone knittingwoman Llywen Brecknwock Breconshire? Not sure about that one.
1871
Looks like Llewellin may have married again?
Glynperfedd, Penderyn Aberdare, Merthyr Tyddfil
Llewellin Morgan, mar 72, farmer 80 acres born Ystradfeflda
Gwenllian Morgan, wife 68 Penderyn
Mary Jones dau, widow, 28 general servant domestic penderyn
Margaret Jones, dau, single,25 " "
Jane Jones, granddaughter, 9 "
John Jones, grandson, 6 "
May be yours, not sure?