Brian Lawson has a marriage for a Sophia Brew to William Taggart in Braddan on August 12 1884.
In the 1901 census a Sophia Taggart married 45 born German is a sister-in-law in Douglas RG13/5303 at 28 Princes Street. The other occupants are Walter Gelling head 30 b. Douglas, Alice Gelling wife 27, b. German and Mona Taggart 15 niece b. Douglas.
I could not find William in 1901, nor William Sophia or Mona in 1891.