What evidence of threats or abuse may form the basis of a duress claim?

Ontario, Canada

The following excerpt is from A.P. v. F.D., 2016 ONSC 2566 (CanLII):

Evidence of threats or abuse at the critical period when the agreement is being negotiated and finalized may form the basis of a successful duress claim (see Ernyes v. Rachlin, [2002] O.J. No. 2278, affirmed 2003 O.J. No. 4229 O.C.A.).

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