Derek Moran
Mode of executing powers
25. (1) A deed executed in the presence of and attested by two or more witnesses in the manner in which deeds are ordinarily executed and attested is, so far as respects the execution and attestation thereof, a valid execution of a power of appointment by deed or by an instrument in writing, not testamentary, notwithstanding that it is especially required that a deed or instrument in writing, made in exercise of such power, be executed or attested with some additional or other form of execution or attestation or solemnity.
http://www.e-laws.gov.on.ca/html/statutes/english/elaws_statutes_90c34_e.htm