Looks like 2 lots of Aaron and Sarah...
1841
Darbey Hand, Dudley
Wm Darby 45 - Nailor
Mary Darby 45
Eliza Darby 25
Moses Darby 20
Sariah Darby 20
Ariarn Darby 15
Nemiah Darby 12
Caleb Darby 8
all b in county
1851
155
Windmill Lane, Dudley
Aron Darby 24 - Spademaker
Sarah Darby 27 - Nailor
Benjaman Darby 4
Caleb Darby 3 Mo
all b Dudley
2 doors away
153
Nancy Darby 51
Richard Knowls 24 - son in law
William Knowls 21 - son in law
Joseph Knowls 19 - son in law
Matilda Darby 17
Sopia Darby 13 - b Dudley
Josiah Darby 10 - b Dudley
others b Rowley, Nailors
1861
106
Darbey Hands, Dudley
David Hadley 58 - Formerly nailormaker
Aaron Darby 37 - Son-in-law - scythe finisher
Sarah Darby 36 - scythe finisher wife
Benjamin Darby 14 - nailmaker
Mary Darby 12 - nailmaker
Caleb Darby 10
Eliza Darby 7
Amon Darby 4
David Darby 2
all b Dudley
1871
4 Hadley's Fold, Dudley
Anton Darby 46 - scythe smith
Sarah Darby 47
Calab Darby 20 - fireman at forge
Eliza Darby 18 - nailor
Aaron Darby 15 - furnace labourer
David Darby 13
William H Darby 10
George Darby 3
all b Dudley
Haven't found Aaron on the 1891 as yet
Not sure which Aaron this one is...
1901
86
Church Square, Belbroughton
Aaron Darby 76 - scythe maker? cutter
Don't think these are connected, thought best note them
1871
93
Village Private House, Belbroughton
Aaron Darby 46 - Scythemaker
Sarah Darby 47
Benjamin H Darby 24 - son lodger
Mary H Darby 2 months - 22years - daug in law
Benjamin Darby 26 - cousin lodger
all b Darley End, scythemakers
I live in my own little world. But it's ok....they know me here!