You have found one site.

Another is www.lawsons.ca where Brian has indexed manx burials and wills as well as late 19th century births & marriages.
Also check the Manx Notebook accessible at the top of this page.
Ancestry.uk has for the 1881 census in Douglas:
Joseph Sproat 38 Head Railway engineer b England
Bethah Wife 42 b England
Samuel 14 son Solicitor's clerk general clerk b England
Mary C dau b. England
Ann s b England

1891
Joseph Head 48 Locomotive superintendant b Maryport England
Bilhah Wife 52 b Maryport
Samuel son 24 Mechanical engineer bLiverpool
Mary C 21 b Cockermouth
Ann S 19 b Wolverhampton

1901
Joseph Head Wid. 58 Engineer mechanical
Mary 31 b England
Ann 29 b England
Collen 3 g'son b Douglas

Brian has burials:
Joseph 69 Braddan 11 Mar 1912
Bilhah 6 Bra28 Sep 1898
James Henry 64 Mau 6 Feb 1926
Margaret 43 Doug 4 Oct 1910
Mary Collin 39 Doug 3 Dec 1908

He has the marriage of Susan Sproat to Isaac Denning on 5 Jul 1859
and the birth of Collin Sproat to Samuel Sproat & Margaret McKnaught on 5 Juj 1897
Samuel & Margaret were married in the April quarter of 1891 in Toxeth Park

Ancestry has a marriage of Joseph Sproat to Bilhah Collins in West Derby in the January quarter of 1866.
In 1871 Joseph, Bilhah, Samuel and Mary are in Wolverhampton