Hi
As far as I know Kent Record Office has not placed an index of the wills it holds online (either on A2A or any other website).
There is a private index to West Kent wills
http://www.davideastkent.canterhill.co.uk/wkpi1.htm12th June 1881
Holy Trinity, Tottenham
Frederick Winder Full Age Bachelor Butcher Tottenham Robert Winder Butcher
Rosina Regatha Hobbs Full Age Spinster Tottenham Joseph Hobbs Cabinet maker
Marriage by banns, both signed
Witnesses Harry Dingley (his mark) and Patience Dingley
9th January 1866
Christ Church Southwark
Frederick Winder 21 Bachelor Butcher 25 Brunswick Street Robert Winder Dead
Ann Williams 19 Spinster 56 Brunswick Street James Williams Draper
marriage by banns, both signed
(there is very little in common with the two Frederick signatures on the marriages)Witnesses John Atcheler and Rosetta Sarah Britton her mark
Some adjustment of age by Frederick on his marriage to Rosina perhaps to accomodate the difference in age
1881 census 31 birth year circa 1850
1891 census 32 birth year circa 1859
1901 census 49 birth year circa 1852
1871 census RG10 420 folio 93
11 Westmorland Buildings St Botolph Aldersgate without City of London
James Williams 73 Head Married Cordwainer Colchester Essex
Mary Williams 66 Wife Married Pulborough Sussex
Ann Winder 22 Daughter Married Machinist St Batholomew City of London
Ann Winder 4 Granddaughter Clerkenwell Middlesex
Frederick Winder 3 Grandson Holloway Middlesex
Martha Williams 45 Daughter Unmarried Milliner St Andrews? City of London
Frances Williams 41 Daughter Unmarried Milliner St Andrews? City of London
as you already know Frederick senior was in prison in 1871.
Ann Winder junior was with her grandparents on the 1881 census at 34 Frome Street Islington
There is this confusing 1881 census entry - if its the same Frederick junior, John could be his uncle but not his brother
RG11 238 folio 111
7 Albert Terrace York Road Islington
John Winder 28 Head Unmarried Butcher Islington Middlesex
Frederick Winder 14 Brother Unmarried Islington Middlesex
10th July 1893 St Luke West Holloway Islington
Fredrick Winder 25 Porter 2 Fakenham Villas Frederick Winder Butcher
Emily Davies 22 Spinster 2 Fakenham Villas Edward James Davies Decorator
both signed, marriage by banns
Witnesses Edward James Davies and Kate Branson?
Of Robert's siblings
There was a Charles Winder a coachproprietor ages 34 in Chatham on the 1841 census.
Marriages Jun 1842
WINDER Charles Medway 5 419
Deaths Dec 1860 Winder Charles Medway 2a 208
There was also a William Winder and wife Agnes who had a son baptised in Chatham in 1837 and moved to Totnes - 1841 and 1851 censuses where Agnes was born. Wife Agnes on the 1851 census gave her age as 38 but William on the 1851 and 1861 censuses in Dorchester gives his age as 32 and 40 which is a trifle young for a son born in at least in 1808. William was a seller of patent medicines.
Regards
Valda