“The Supreme Court of Canada and this court have consistently held that joint or parallel custody should only be ordered where the parents can co‑operate and communicate effectively: see, for example, Young v. Young, 1993 CanLII 34 (SCC), [1993] 4 S.C.R. 3 at para. 44; Kaplanis v. Kaplanis, 2005 CanLII 1625 (ON CA), [2005] O.J. No. 275 at 4 (C.A.).”