Another William Grundy is a cordwinder age 22 a visitor of the Rick family at new street liverpool
I haven't found Harriet/Sarah Grundy b1805 or earlier on any 1851 census or a death for her .
And no appropriate William Grundy senior in other censuses
The banns for William Grundy and Harriet Northeast were 26 Jan 1827 St Nicholas Liverpool
Thanks for Mary Ann Healey's birth.... Heywood
So definitely 3 or 4 years before her parents marriage