The likely reason is that: the son never effectively accepted delivery of the deed before he died.
In law a deed can be defined as a document that entails the agreed terms and conditions of a land ownership between two people or two or more people or parties.
Based on the given scenario if the mother brought an action against her son wife after the dead of her son based on who the title of the farm belongs to, the mother might likely win the case because her son never accepted the deed of the land ownership.
Therefore the likely reason is that: the son never effectively accepted delivery of the deed before he died.
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