***********
Marriage from IGI:

Name: James Hornby
Birth Date: 1866
Age: 32
Spouse's Name: Mary Turner
Spouse's Birth Date: 1876
Spouse's Age: 22
Event Date: 08 Aug 1898
Event Place: Castleford, York, England
Father's Name: Andrew Hornby
Spouse's Father's Name: John Turner

Ancestry’s image shows:
Parish church of Castleford, Yorkshire.
JH/32/bachelor/wine and spirit merchant/15 Regent St/father Andrew Hornby (deceased) horse trainer.
MT/22/spinster/15 Regent St/father John Turner, cord werder ?
Both signed.
witnesses: Joseph Turner and Hannah Beardsmoar (her x mark)

*********
1911 census shows Mary, 4 children and a boarder living in 3 rooms on Tynwald Terrace, Douglas, IOM ----- Mary b Castleford, 3 oldest children b Yorkshire and youngest born Douglas.

***********
1901
116 Wood View Road, Nether Hallam, Sheffield

Ancestry’s transcription:

Name Age
James Hornby 34
Mary Hornby 25
Luis Hope Hornby 2
Edwin Velmon Hornby 10/12

notes:
JH 34 hotel cellarman b Garstang, Lancashire
MH 25 wife b Castleford
Lorna Hope Hornby 2 b Sheffield
Edwin Valmar Hornby 10 months b Castleford.

********
So it looks as though your Hornby and Turner ancestors didn’t have Manx ancestors ---- they just happened to be living on the IOM when one of their children was born.

Jean C