Is a spouse entitled to anything if written out of a will?

The judge is moving toward a trial as there are five wills, three of which my father wrote after being diagnosed with dementia, and so everyone is arguing for a different will, including the surviving spouse. My question is, even though he wrote her out of the will, will the court entertain her petition for a spousal share? What are the chances she gets something? And should I challenge the marriage as well as the will? My father had dementia and wouldn’t have been able to read anything. —Peter