Marriage Brighton St Nicholas Sussex

I need help to research my ancestor. Here is some information.
My Name: M.A. de Paula Lopes
My Country: The Netherlands
Ancestor's Name: William Parks & Mary Reed
Locations: Married 04 dec 1828 St. Nicholas Brighton Sussex
My goal: Finding their parents and grandparents
Additional information: William was born around 1791 and died between sep 1845 Holborn. Mary was born about 1801 Sussex and died after 1851. They had one daughter also born in Brighton: Emma Parks; Baptised 11 march 1832 St. Nicholas. Idecend from her brother Henry Thomas Parks, who was baptised 02 apr 1837 St. Lukes Middlesex, born 17 dec 1836 Finsbury.