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Alice Edith Esther WATKINS died on 27 October 1946 at 6 p.m in Antwerp (St-Elisabeth Hospital)
Born 11 October 1896 Woolstone, England, without profession, residing at Antwerp, Luxemburgstraat nr. 36, wife of Joannes Baptista BRUYNSEELS, without profession, daughter of the late William WATKINS and the late Esther WOOD
The informants were employees of the hospital

Felix Archief  (city archives Antwerp)
death register
https://felixarchief.antwerpen.be/detailpagina?invnr=2992_171&page=1&pageSize=10&type=copy
click on the link ‘Overlijdensregister.pdf’     (it takes a while)
image 16 of 304   (cert nr. 3057)

register with the causes of death
https://felixarchief.antwerpen.be/detailpagina?invnr=MA_74590&page=1&pageSize=10&type=copy
image 91 of 115     (nr. 3057)
Cause of death: heart disease

Joannes Baptista BRUYNSEELS remarried later and he died in 1959.  (certs not online, only the death index)
There is a Joannes Baptista BRUYNSEELS born in 1877 Antwerp, but I don’t know whether he is the right one. This one married in 1901.
Do you know the name of Joannes Baptista his father (marriage cert Bruynseels-Watkins)?

marriage date of son John Robinson mentioned in colomn 10 (31/10/66) on the 1860 population register,  (see ShaunJ’s reply #1)
marriage John Robinson, 33 years old, born in Saint Saviour, Surrey, England, son  of Charles Robinson, residing Darlington, England and Margaret Brockbank, deceased.
x 31 October 1866 Rotterdam with Wilhelmina Catharina Keuzekamp   
https://hdl.handle.net/21.12133/6E9E5A7E45A14268BC9CF9890193BD0C

marriage attachments  image 208 up to 215
https://www.familysearch.org/ark:/61903/3:1:939X-5LS3-T?i=207&cc=1576401&cat=153344

Marriage contract of his brother ? Pierre Daire, same place : Monthewis-dessous
https://nl.geneanet.org/registers/view/218839/56?individu_filter=19910771

see below informations historiques, ....  https://archivespasdecalais.fr/Recherche-par-commune/Lettre-L/La-Calotterie

some information from the population registers of Leuven

population register Leuven 1900-1910 //  book 14 - page 3468 // image 739)
https://www.familysearch.org/ark:/61903/3:1:3QHV-Y3GQ-B9SH-5?i=738&cat=1175287
date of arrival at Leuven 10 May 1904 : n° 80, boulevard de Jodoigne (previous address : n° 17, rue Neuve, Welkenraedt, Liège, Belgique)

1 - Mathieü Dünker  born 7 Februari 1864 Landkern, Prussia  // commercial traveller // married 18 October 1890 Essen
2 - wife : Anne Lichte  born 3 May 1868 Rosenberg, (Prussia ?)
3 - son : Mathieü Dünker  born 29 July 1891 Essen, (Prussia ?)
4 - son : Pierre Guillaume Joseph Bernard Dünker  born 22 November 1894 Gelsenkirchen (Prussia ?)
5 - son : Jean Guillaume Englebert Dünker  born 2 April 1899 Verviers, Liège, Belgique  (wrong birth month (Februari) in population register, see his birth cert. below)
https://www.familysearch.org/ark:/61903/3:1:9Q97-Y9S9-2P9?wc=SRG2-4W5%3A1008535901%2C1448825201&cc=2138505 image 52  // n° 265
6 - daughter : Clara Julie Marie Anne Adelaïde Dünker  born 30 June 1906 Leuven, Vlaams-Brabant, België

population register Leuven 1900-1910 //  book 20 - page 4871 // image 635)
they all moved at 15 May 1907 to n° 4, Standonckstraat, Leuven
https://www.familysearch.org/ark:/61903/3:1:3QHV-Y3GQ-19WB-K?i=634&cat=1175287

population register Leuven 1900-1910 //  book 12 - page 2801 // image 90)
and at 9 August 1910 all six moved to: n° 2, Charles de Bériotstraat, Leuven
https://www.familysearch.org/ark:/61903/3:1:3QHV-T3GQ-B9QJ-B?cat=1175287

Firmin Louis Joseph Mengeot born 16/03/1878 Farciennes, Belgium, married in Brussels 30 June 1906 to Camilla Eugenia Alina Maria Simon  (a Belgian Simon, she was born in Antwerp 18 July 1878, daughter of Camille Charles Leopold Simon born 1843 Bouillon, Belgium and Celina Sophia Maria Lair, born 1849 Brussels).  Firmin and Camilla had a daughter Yvonne Gabrielle Suzanne Mengeot born 29 November 1902 Namur, Namur, Belgium

On the 1931 Montreuil census (reply #13), Leonie Adolphine Houdret and Firmin Louis Joseph Mengeot both lived in the rue Parmentier n° 71, but in different households. 

On the 1936 Paris census,  Leonie Houdret lives in the rue d’Avron n° 144, “chef” (head) of the household, the only other member of the household is Firmin Mengeot, he is “A” of Leonie.  (A ? = ami ?)

Firmin Mengeot  was one of the witnesses on  Isabella Simon’s  marriage (x 1935)

Leonie Houdret still lived at rue d’Avron n° 144 when she died  (+1959)

Firmin Mengeot died at home rue d’Avron n° 144  + 27 March 1961   http://www.rootschat.com/links/01ppx/
burial register  cimetière parisien de Pantin, Bobigny, Seine-Saint-Denis  http://www.rootschat.com/links/01ppy/

So Leonie Houdret and Firmin Mengeot knew each other for a long time.  There’s some info on Ancestry for Firmin Louis Joseph Mengeot, Camille Eugenie Aline Marie Simon and Yvonne Gabrielle Suzanne Mengeot.  I don’t know exactly what (I don’t have a subscription), but maybe the person who put this online knows something about your Simon’s.