Does an ex-spouse have any authority over an intestate estate?

Question Details:

This question falls under NE intestacy law. Recently, my mother-in-law passed away in a car accident. She was very recently divorced (finalized 45 days prior and effective only 2 weeks prior to her death). She had no will. She left behind 2 children aged 21 and 12. Her ex-husband was awarded custody of the minor child in the divorce. We are assuming that her eldest child (my wife) would be the default Personal Representative for her estate, since there were no surviving heirs of legal age, but he disagrees. Does her ex have any direct authority over her estate?

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