Margaret
There's a very strong possible for son Thomas on the 1851 - in Weekley which is not far from Kettering - HO107/1744 F 464 P 10.
Aged 27, a painter and decorator, married to an Elizabeth. Born London, Middlesex. This ties in with a bpt. on the IGI -
St Botolph, Bishopsgate. 19 Dec 1824: Thomas Nixon. Father: Thomas Nixon. Mother: Margaret
Gadget