“In our view, a party to a marriage contract cannot enter into it knowing of shortcomings in disclosure and then rely on those shortcomings as the basis to have the contract set aside: see Raaymakers v. Green, 2006 CanLII 719 (ON CA), [2006] O.J. No. 124, 25 R.F.L. (6th) 54 (C.A.), at para. 40.”