“A trial judge’s findings of fact, including credibility assessments, are entitled to substantial deference on appeal “especially in family law cases”: Rados v. Rados, 2019 ONCA 627, 30 R.F.L. (8th) 374, at para. 23. Moreover, the imputation of income for support purposes is a discretionary and fact-specific exercise: Bak v. Dobell, 2007 ONCA 304, 86 O.R. (3d) 196, at para. 73, aff’d in Korman v. Korman, 2015 ONCA 578, 126 O.R. (3d) 561, at paras. 49 and 51.”