A person can change their will up until death, as long as they have the mental capacity to do so.
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Unfortunately it his property and as long as he has capacity to do so, he can change his will at any time.
Actively practicing law in Texas. Inactive licenses in Arizona and Georgia. All answers are general in nature and no attorney/client relationship exists in this forum.
There is no automatic "right" of inheritance for children, and a competent adult may leave his property to anyone he chooses (with certain exceptions for a spouse that do not apply here). So, if he chooses to change his will after the death of his son, you cannot prevent that from happening.