If your husband received money from his father's life insurance before you got married, it is likely considered his separate property. In many jurisdictions, assets acquired before marriage are typically considered separate property, and they are not subject to division in the event of a divorce or separation.
However, laws regarding property and assets can vary significantly depending on your jurisdiction, and some regions have community property laws that may affect the characterization of assets obtained during the marriage. It's essential to consult with a legal professional who specializes in family law in your area to understand your specific rights and entitlements.
If you have concerns about financial matters in your marriage or potential future separation, it may be a good idea to have open and honest communication with your husband about your financial expectations and concerns. Additionally, you might consider seeking legal advice to understand your rights and responsibilities under the applicable laws in your jurisdiction.