Hi Phain,
First welcome to Roots Chat - friendly people ready to help!
Can't find Martha Winch in 1891 (has probably died)
In 1891 Martha Winch was living in the High Street Burnham.
In the 1881 census RG 11 Piece 1461 Folio 30 Page 6
My 3 X Great Grandfather Thomas Vincent, born 1801. The head of the household is Martha Winch a widow aged 46 with 4 children aged between 6 and 15 all born in Burnham Bucks. Thomas is a widower aged 81 and classed as stepfather! I don't have any any info on Martha Winch - I assume he was Stepfather to Martha.
In the 1871 census Thomas was at this address - Dropmore Road, Alma Row, Burnham and agd 70 with his 12 year old son Alfred and is working as a Beer House Keeper.
And that's all I have! So we are 20 years apart with relatives. I still haven't worked out exactly where the Grenville Arms were.............
Sorry I can't be more help,
Regards,
Abiam