From the Potton St Marys Monumental Inscriptions is an entry (which I will simplify - cutting out all the flowery religious script) that say George Youd died 10 Feb 1836 age 56; also Mary Youd, relict of the above, died 26 Oct 1862 age 72.
Another entry has Mary Youd, wife of George Youd died 3 Jan 1819, age 38.
Now I know (from IGI extractions) George & Mary had children baptised Potton 1822 to 1824, & that George Youd married Mary Inskip on 26/06/1821 at Northill; and that there is a Mary Youd age 62 widow born Northill on 1851 census & age 69 widow born Ickwell on 1861 census.
So I am supposing that in this case 'relict' refers to widow; and thus George married twice, both times to Marys. It cannot be his mother, also Mary, I've got her buried in 1823.
You'd better believe it . .. . sorry
regards John