Hi Cas. 1851 rest of family HO107/2499/568/2?
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Yay you found them, don't know how I missed them, guess Jones overload
same address as 1841.
EDIT Didn't look in Montgomeryshire.
1851 Ty Ucha, Llancadwalladr, Llanfyllin, Montgomeryshire, Wales. All b Llangadwaladr, Denbighshire, except wife Sarah.
Richard Jones Head Married 37 Farmer
Sarah Jones Wife Married 33 Farmer's Wife Denbighshire
Mary Jones Dau Unmarried Female 13 Scholar
Sarah Jones Dau Unmarried Female 10 Scholar
Edward Jones Son Unmarried Male 8 Scholar
Jane Jones Dau 6 Farmer's Daughter
Catherin Jones Dau 4 Farmer's Daughter
Richard Jones Son 1 Farmer's Son
2 servants
So looks like Sarah 1841 is the likely mother as the others are too young, Edward is unmarried with parents in 1891. They name another Dau Sarah, the youngest child, b c1862 so the one b c1841 must have died at some point perhaps in childbirth?
Possible, The Family were in this Reg district in 1861, would tie in with census.
Death JONES, SARAH Age 21
GRO Reference: 1861 M Quarter in CORWEN Volume 11B Page 350
Birth JONES THOMAS Mmn JONES (she married a Jones or he is illegitimate)
GRO Reference: 1861 M Quarter in CORWEN Volume 11B Page 400
There is a POSSIBLE marriage in 1859 for Sarah Jones/Thomas Jones in Corwen Reg district.
This needs to be verified, I would start with the 1892 marriage cert that will give you witness, possible both fathers and address that you can maybe link to census.
Good luck
Regards Cas