Is it legal to leave someone out as a person of interest in a probate matter?

Question Details:

My father was legally separated from his wife and died suddenly in my home. Then 2 months later his wife died in their home. My stepbrother told me that we would deal with this as a family and I was under the assumption we would be combining the probate process. I found out that probate paperwork has been filed for his mother and I have been left me out as a person of interest. Is this legal? What can I do?

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