Hello,
You 2 are blooming` marvellous!!!

Fantastic findings Willsy & Dizziefish.

I`ll follow on with reference to your results shortly but firstly I wanted to post the details of Samuel Brewin`s birth.
Samuel Brewin 4 Jun 1860. Abode; 4 Dixon's Court, Lincoln.
Father---
NONE listed.
Mother Fanny Brewin
NO maiden name given.
Registered by Fanny Brewin 21 Jun 1860.
CHR/-Samuel Brewin 1 Jul 1860 St Paul-in-the-Bail, Lincoln. Mother Fanny. Father James deceased.
Samuel died 1 Jan 1885, age 24 in the North Sea, a 2nd Hand in the Merchant Marines.
I believe that you were correct with your finding the burial & newspaper details for James & Mary Bruin, that this man was the Husband/partner of Fanny.
Buried; 13 Sep 1858 at Horncastle, East Lindsay District, Lincolnshire. Address; Foundry Street.
James age 32. I`ll try and track down his or Mary`s death GRO to order the cert;
When Samuel married Mary Eliza Flinn he recorded his father as being Benjamin Brewin. He and Mary married 1884 St Andrew, Great Grimsby.
All the above locations are places that we know Fanny & James frequented. In my opinion, James died in 1858 and Fanny had a brief relationship with a Benjamin Brewin, possibly James`s Brother, although I am aware that there were other Benjamin`s born of the same/similar time period.
A Brief relationship, because James died Sep 1858 and Samuel was born Jun 1860 and Fanny was living as a widowed woman in the 1861 census at Lincoln with some of her children and Niece.
If Samuel`s real Father was Benjamin, Brother of James, could that be why he and Susannah Matlock never married? Samuel was informed of his real Father`s details and recorded him in his 1884 marriage entry, could be that others were also aware of his having a different Father?
What do you both think?