HI Alison,
The 1881 census @ www.familysearch.org gives the following:

Thomas F. MADDRELL

Male

Other Information:

Birth Year

Birthplace Ballamaddrell (Arbory), Isle of Man, England

Age 19

Occupation Student Of Theology

Marital Status U

Head of Household Alexander G. BOYD

Relation Visitor

Disability

Source Information:

Dwelling Broxbourne St

Census Place Broxbourne, Hertford, England

Family History Library Film 1341341

Public Records Office Reference RG11

Piece / Folio 1399 / 26

Page Number 6

The household includes:

Household:

Name Relation Marital Status Gender Age Birthplace Occupation Disability
Alexander G. BOYD Head M Male 30 Cheshunt, Hertford, England Manchester Warehouseman
Charlotte C. BOYD Wife M Female 22 Peel, Isle of Man, England
Frances J. MADDRELL Visitor U Female 25 Ballamaddrell (Arbory), Isle of Man, England
Thomas F. MADDRELL Visitor U Male 19 Ballamaddrell (Arbory), Isle of Man, England Student Of Theology
Sarah A. HANDSCOMBE Serv U Female 17 Waltham Cross, Hertford, England Housemaid Domes Serv
Sarah GORDON Serv U Female 35 Stonehouse, Devon, England Cook Domes Serv

Frances Maddrell age 25 is his sister - see below.

The IGI gives the following:

THOMAS FISHER MADDRELL
Male
Christening: 08 NOV 1861 Arbory, Isle Of ManParents:
Father: JOHN MADDRELL Mother: ANNE FISHER

Thos Fisher Maddrell's siblings are (again from IGI):
Mary Anne bpt 1845 Arbory
Robert Henry bpt 1847 Arbory
John James bpt 1849 Arbory
Joseph bpt 1851 Arbory
Margaret Jane bpt 1853 Arbory
Frances Isabella bpt 1856 Arbory
Elizabeth bpt 1858 Arbory

Hope this helps.

Elizabeth