Alfred can be seen in 1891 living with his widowed sister and her two children.
Sarah A Marston widow 29 dressmaker
Arthur A Marston son 8
Elizabeth K Marston daughter 5
Alfred Knibbs brother 19 Bicycle Driller
__________

Alfred is seen to be living at 17 Edward Street, Reddich, Worcestershire at the 1901 census of Cycle Turner, with his wife Lizzie, son Sidney age 2 years and daughter Lilian aged 11 months
Alfred Knibbs 29 Worcester Birmingham Hub Turner Cycle
Lizzie Knibbs 23 Worcester Redditch �
Sidney H Knibbs 2 Birmingham Balsall
Lilian Knibbs 11m Worcester Heath �
Mary Ann Merry 66 mother-in-law Worcester Reddich
Edwin Merry 26 brother-in-law Worcester Reddich
Ada Merry 12 niece Birmingham Hockley

So we see from this that Alfred had his mother-in-law, brother-in-law who was employed as a "Crank Polisher Cycles", and his niece, employed as a Domestic Servant, living with him at this time. The brother-in-law was identified as unmarried, so clearly Ada Merry was the daughter of another of Lizzie's brothers or sisters.

Apparently, Edward Street is just on the left as you come into Redditch down the Bromsgrove Road immediately before the Railway Station.

We can see Lizzie at the 1881 census living with her mother and 7 siblings at 15 George St., Redditch, Worcester, England. Her mother Mary Ann Merry was given as head of the household:

Mary Ann MERRY Head W Female 46 Redditch, Worcester, England
Mary Ann MERRY Daur U Female 21 Redditch, Worcester, England Needle Paperer
Margaret MERRY Daur U Female 16 Redditch, Worcester, England Needle Case Maker
Ann MERRY Daur U Female 13 Redditch, Worcester, England Fishing Tackle Maker
Thomas MERRY Son Male 11 Redditch, Worcester, England Threading Needles
Walter MERRY Son Male 9 Redditch, Worcester, England Scholar
Edwin MERRY Son Male 6 Redditch, Worcester, England Scholar
Lizzie MERRY Daur Female 4 Redditch, Worcester, England
Fanny MERRY Daur Female 2 Redditch, Worcester, England
Mary A. DEVEY Boarder U Female 14 Redditch, Worcester, England Label Cutter