Starting point is the death entry for their son George:
Signalman
DANCE, GEORGE
Service Number 8262
Died 14/09/1914
Aged 27
H.M.A. S/M. "AE1"
Royal Australian Navy
on loan from (R.N./230063)
Royal Navy
Son of Police Inspector Dance, of Brill, Thame, Oxon; husband of Annie E. Hinstudge (formerly Dance), of 28, Queen St., Emsworth, Hants.
Source: https://www.cwgc.org/find-war-dead/casualty/3044799/dance,-george/
George with his parents in 1891:
"England and Wales Census, 1891," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:4GXZ-8N2 : 10 December 2017), George Dance in household of George Dance, Chesham, Buckinghamshire, England; from "1891 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 12, Buckinghamshire county, subdistrict, The National Archives of the UK, Kew, Surrey.
Father's occupation is Police Constable, which fits with the death entry. George is living with his sister Beatrice, born about 1890.
George with his parents in 1901:
"England and Wales Census, 1901," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:X9Y1-JND : 8 April 2016), George Dance in household of George Dance, Haddenham, Buckinghamshire, England; from "1901 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing Haddenham subdistrict, PRO RG 13, The National Archives, Kew, Surrey.
Father is still a Police Constable. George now has siblings William (1892), Florence (1894), Maud (1896), Mabel (1899) and Thomas (1901)
