He can ask for half in a divorce action. Speak with an attorney to see how you can protect yourself
If you are referring to a divorce, then that money is a marital asset, likely, and subject to division by the divorce court.
This question is too vague to answer property. What context would he be seeking a share of your inheritance? Divorce? Long term care support? His potential inheritance from you? I recommend you consult with an attorney to determine your rights and responsibilities.
The above answer does not create an attorney/client relationship. No legal answer can be relied upon without meeting with a licensed attorney and the attorney obtaining the complete facts and examining the applicable documents.
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