I’ve just noticed that in 1861 there was a lodger, William Jones b Welsh Newton, Herefordshire, who may have been a brother or cousin of Ann.

Have you got this census ?
1871
Ancestry’s transcription:

Name: Thomas Luce
Age: 69
Estimated birth year: abt 1802
Relation: Head
Spouse's Name: Ann Luce
Gender: Male
Where born: Isle of Man
Civil Parish: Monmouth
County/Island: Monmouthshire
Country: Wales
Registration district: Monmouth
Sub-registration district: Monmouth
ED, institution, or vessel: 1
Household schedule number: 69
Piece: 5303
Folio: 10
Page Number: 13
Household Members: Name Age
Thomas Luce 69
Ann Luce 67

notes:
TL 69 assistant in coal trade b IOM
also in same household as Thos and Ann:
Emma Herbert mar 35 b Monmouth Forge
Alfred 6 and Sarah E 2, chn of Emma b Buckholt Mon.
Emma Lace married Benjamin Herbert Sep Q 1863 Monmouth.

*******
Death:
Name: Thomas Lace
Estimated birth year: abt 1800
Registration Year: 1880
Registration Quarter: Oct-Nov-Dec
Age at Death: 80
Registration district: Monmouth
Parishes for this Registration District: View Ecclesiastical Parishes associated with this Registration District
Inferred County: Monmouthshire
Volume: 11a
Page: 21

******
Jean C