marriage 21 Nov 1863 in Patna give his father as James Heher
https://www.familysearch.org/ark:/61903/1:1:FGND-S31This looks like a second marriage in 1879 to Isabella Fanny Scanlan
https://www.familysearch.org/ark:/61903/1:1:FGNY-7VSburials
Howrah 12 Nov 1872 Alice Lena aged 3 years 9 months daughter of Mr & Mrs Dennis Heher, Station Master, cause of death - cholera
Raneegunge 1 June 1874 Herbert Lister age 2 son of D Heher
Bankipore & Patna 30 April 1884 Dennis age 4 months son of Mr Heher Station Master Patna Cause of Death Diarrhoea buried in the city cemetery
Patna 26 Nov 1885 Dennis Heher 44 Station Master Patna cause of death - septicaemia
baptisms
Mirzapore 25 April 1865 Lilias Isabel daughter of Dennis, station master, & Annie Heber - burial same year
https://www.familysearch.org/ark:/61903/1:1:FGL8-QJSMirzapore 27 March 1869 Alice Lina daughter of Dennis, station master, & Annie Heber
Raneegunge 16 July 1876 Edwin Clifford son of Dennis, station master, & Annie Heher - he died in 1943 in Pietermaritzburg
https://www.familysearch.org/ark:/61903/1:1:6NF9-QHCYChupra 17 May 1886 Reginald Francis son of Dennis & Isabella Frances Heber - he shows up later in the merchant navy, is in Islington on the 1939 register, death registered in 1958.
Baptism of 2nd wife
Serampore 15 Jan 1852 Isabella Fanny Born 31 Aug 1851 daughter of Patrick Henry Scanlan, merchant
2nd marriage 1896? Isabella Fanny Heher to John Henry McDowell
burial Fort William Bengal 12 Feb 1897 Isabella McDowell 43 wife of J H McDowell 2nd engineer SS Hughli cause of death valve disease of heart
Mistranscriptions of surname aren't helping.