“Breaches of a court order can constitute a material change in circumstances. See: LW-A v. JC, 2017 ONCJ 741; Maloy v. Pantalone, 2021 ONSC 7734.
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Worsening conflict can constitute a material change. Wreggit v. Belanger, 2001 CanLII 20827 (ON CA); Hackett v. Sever, 2017 ONCJ 93.”