The rights under a will of a beneficiary who predeceases the testator are governed by s. 854.06.
Wis. Stat. § 853.27
A will clause providing that if any beneficiary dies within 5 months of the testator, the deceased beneficiary's share is to be treated as if the beneficiary predeceased the testator, served to pass a deceased beneficiary's share to her children under the anti-lapse statute. Firehammer v. Marchant, 224 Wis. 2d 673, 591 N.W.2d 898 (Ct. App. 1999), 98-0586.