Here's the family in 1901-
www.census.nationalarchives.ie/pages/1901/Antrim/Saint_Anne_s_Ward_Belfast/Roden_Street/953827The 6 children-
James (3 Apr.1885)
Thomas (18 Nov.1887)
Eleanor (c1892-9 Nov.1908)
Richard Charles (19 Apr.1894)
Maria (21 Jan.1897-28 Nov.1906)
William Wentworth Houston (19 Oct.1899)- born a few months after father died, listed as 'daughter' in 1901
In 1911 it's just Maria & the 2 youngest boys (now Presbyterian rather than Church of Ireland as in 1901)-
www.census.nationalarchives.ie/pages/1911/Antrim/Shankill/Tennent_Street/153237Looks like Maria and sons Richard and William are buried together at Dundonald Cemetery (C1 336)-
Richard Surplus, 72 Devonshire St., age 38, died 5 Aug.1932 at 51 Lisburn Rd., buried 8 Aug.1932
William Surplus, 44 Queen Victoria Gdns, age 32, died 13 Apr.1933 at Royal Victoria Hospital, buried 15 Apr.1933
Maria Surplus, 44 Queen Victoria Gdns, age 77, died 9 Mar.1941 at 51 Lisburn Rd, buried 11 Mar.1941
From PRONI Will Extracts-
Administration of the estate of
Thomas Surplus late of 56 Sandymount-street Belfast Foreman who died 4 June 1899 granted at Belfast to Maria Surplus of 56 Sandymount-street Belfast the Widow. Effects £206
Surplus Maria of 44 Queen Victoria Gardens Belfast widow died 9 March 1941 at 51 Lisburn Road Belfast Probate Belfast 19 June to Thomas Surplus civil servant. Effects £259 16s. 7d.
Surplus William Wentworth Houston of 44 Queen Victoria Gardens Belfast upholsterer died 13 April 1933 at The Royal Victoria Hospital Belfast Administration Belfast 12 May to Euphemia Surplus the widow. Effects £179 15s. 2d.