No birth or death record on FreeBMD up to 1910.

I wonder if either of these two marriages on FreeBMD, the only William Bellasis marriages from 1876 to 1920, were his:

Surname First name(s) District Vol  Page
Marriages Mar 1877   (>99%)
BELLASIS William Marylebone 1a 871   
Marriages Jun 1892   (>99%)
Bellasis William Kensington 1a 363
__________________

Somehow in 1881 he, the youngest son, has inherited his parents old house, has retired, is living on dividends and has a small family:

Surname   Forename   Age   Relation   Occupation   Birth Place

Bellass William 27 Head Dividends -, Middlesex
Bellass Mary 25 Wife Dividends -, Essex
Bellass Mary T 3 Daughter -, Middlesex
Bellass John H 4 M Son -, Middlesex
Walmsley Thomas 57 Father In Law Dividends   -, Middlesex
Walmsley Teresa 20 Sister In Law Dividends   -, Kent
Katherston Mary 44 Servant Domestic Servant   -, Ireland
Brinne Mary A 24 Servant Domestic Servant -, Kent
Flynn Margaret 22 Servant Domestic Servant  -, Kent
Wareing Amy 21 Servant Domestic Servant Gloster,

Address: 22 Prince Of Wales Terrace
Registration  District: Kensington, Middlesex
Parish:
Image Reference: RG11/0023/~F40

The above establishes that he married Mary Walmsley in 1877.
_______________

Their marriage:

Surname First name(s) District Vol  Page
Marriages Mar 1877   (>99%)
Allen Emmalina Marylebone 1a 871
BELLASIS William Marylebone 1a 871
Butler Thomas Marylebone 1a 871
Walmesley Mary Marylebone 1a 871
__________________