[17] The issue of reasonable apprehension of bias was most recently discussed and considered by this court in Martin v. Sansome, 2014 ONCA 14 (CanLII), 2014 ONCA 14. In that case, the context was interventions by a trial judge during the examination of witnesses. This court set out the legal framework for the assessment of bias in the following passage at paras. 31-33:

[31] Bias is a predisposition to decide an issue or cause in a certain way that does not leave the judicial mind open and impartial: Wewaykum Indian Band v. Canada, 2003 SCC 45 (CanLII), 2003 SCC 45, [2003] 2 S.C.R. 259, at para. 58. The burden of establishing bias is on the party arguing that it exists. The test, found in Wewaykum, at para. 60, is long-established:

[W]hat would an informed person, viewing the matter realistically and practically – and having thought the matter through – conclude [?] Would he think that it is more likely than not that [the decision-maker], whether consciously or unconsciously, would not decide fairly[?]

[32] There is a strong presumption of judicial impartiality. The threshold is high for finding an apprehension of bias: Wewaykum, at para. 76.

[33] In Chippewas of Mnjikaning First Nation v. Chiefs of Ontario, 2010 ONCA 47 (CanLII), 2010 ONCA 47, 265 O.A.C. 247, leave to appeal to S.C.C. refused, 33613 (July 18, 2010), at para. 230, this court provided additional guidance:

A determination of whether a trial judge’s interventions give rise to a reasonable apprehension of unfairness is a fact-specific inquiry and must be assessed in relation to the facts and circumstances of a particular trial. The test is an objective one. Thus, the trial record must be assessed in its totality and the interventions complained of must be evaluated cumulatively rather than as isolated occurrences, from the perspective of a reasonable observer throughout the trial.

.[18] In Martin v. Sansome, the appellant was a self-represented litigant. The trial judge tried to help him with procedural issues, but was apparently impatient and frustrated with the slow progress of the trial. On appeal, the court concluded, at para. 39, that, although some of the trial judge’s comments could create the impression of favouring the respondent when viewed in isolation, when the entire record was viewed as a whole, the court was not satisfied that “a reasonable person would have the impression that the trial judge was predisposed to decide the issues before him in favour of the respondent.”

[19] In this case, the comments of the application judge did not come in the context of witness testimony but during the oral argument of the application. The application judge made two types of comments that could raise a concern in the mind of a reasonable person that he was predisposed to decide the issues before him in favour of the respondent.

[20] The first were comments about the credibility of police officers and his concern about making an adverse credibility finding about a police officer. In this case the respondent and his common law wife were officers while the appellant, the mother, was not.