Anna, to search IOM records you need to use census records and wills to sort out one "same name" family from another. See the indexes at www.iomfhs.im/lawsons/LawsonBMD/Main_Site_index.html

The 1851 census has:
Name, Relation, Condition, Se x, Age, Birth Year, Occupation, Disability, Where Born:
CALLISTER, Thomas Head Married M 40 1811 Farmer Of 20 Acres Employs 2 Lab
German Isle of Man
CALLISTER, Mary Wife Married F 24 1827 Jurby Isle of Man
CALLISTER, Elizabeth Daughter Unmarried F 6 1845 Patrick Isle of Man
CALLISTER, Ann Daughter Unmarried F 1 1850 Patrick Isle of Man
CALLISTER, Thomas Son M 2 1849 Patrick Isle of Man

RG number:HO107 Piece:2523 Folio:71 Page:3
Civil Parish:Patrick Municipal Borough:
Address:Ballanass, Patrick County:Isle of Man

The IGI on Familysearch.org has an extracted (from the par reg) entry for MARY ANNE CALLISTER Christening: 03 MAR 1850 Patrick, Isle Of Man,Father: THOMAS CALLISTER, Mother: MARY.
Also for JOHN THOMAS CALLISTER Christening: 06 AUG 1848 Patrick, Isle Of Man, Father: THOMAS CALLISTER, Mother: MARY KINREAD.
ELIZABETH CALLISTER Christening: 10 AUG 1845 Patrick, Isle Of Man Father: THOMAS CALLISTER, Mother: MARY KINREAD.

Thomas Callister & Mary KINRADE Marriage: 22 AUG 1844 Kirk German.

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