Hi Jon,
Sue Pedersen is much more knowledgeable and accurate than I am and she is spot on when she suggests that you check the marriage register to get a lead on Thomas's father. However, here is something to ponder.
All taken from the Index on Steve Brew's web site.

1851 CENSUS Living at Balla ?
Thomas BREW 2 Grandson b. Andreas
John BREW 1/12 Grandson b. Andreas
Would seem to be living with a none Brew family

1861 CENSUS Living at Ballacheany
Thomas BREW 12 Grandson b. Andreas
Elizabeth BREW 21 Servant b. Bride
Again living with a none BREW family

1871 CENSUS
Thomas BREW 22 b. Andreas

on a vessel called "Puffin"

1881 CENSUS Living at Ballaugh
Thomas BREW 33 Fisherman b. Andreas

on a vessel "Golden Plover"
Elizabeth BREW 32 b. Jurby
William BREW 3 b. Ballaugh

1891 CENSUS Living at Oak Hill Cottage, Braddan
Thomas BREW 42 Farm Lab. b. Andreas
Elizabeth BREW 42 b. Jurby
William BREW 13 Farm Lab. b. Ballaugh
Frederick BREW 10 b. Ballaugh
Elizabeth BREW 7 b. Braddan
Florence J. BREW 2 b. Braddan
Jamea A. BREW 7 mo b. Braddan

1901 CENSUS Living in Onchan
Thomas BREW 52 Tram Driver b. Andreas
Elizabeth BREW 52
William BREW 23 Drapers Asst. b. Ballaugh
Frederick BREW 20 Butcher
Florrie 12 b. Braddan
James BREW 10 b. Braddan

You probably know all this already but it was an interesting exercise.

Regards
Keith Wright