What's the law that governs Wills if one of the people mentioned in the Will has a spouse but is legally separated?

Question Details: My grandfather passed away a year ago in KY. He made his Will and appointed his son, my uncle, as the executor. We all live in IL. The Will states that 50% of the assets will go to him, 25% go to my mother and 25% go to my aunt. My uncle went gone through all of the needed steps and it seemed like everything was almost done. However, he came to my mother the other day and said that since she is still legally married, half of her 25% would go to her husband. My mother is legally separated from her husband and has been for at least 5 years. All of their assets are separated; they don't live together. They haven't gotten divorced because they can't afford it. My uncle said that KY doesn't recognize legal separation when it comes to divvying out estate assets. Is this true? Is there anything that we can do about this? Her husband hasn't had anything to do with the family at all, so it seems highly illogical that he would get any of the assets simply because my mother is still married.

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