What happens to jointly owned real estate if one of the co-owner's dies?

Question Details:

My middle brother passed away 3 months ago. His divorce was final last year. He and his ex-wife have a 13 year old son and owned 2 homes. They were living in AZ but my brother's job had him stationed in TX. My brother and another brother and myself all owned our deceased parents home, which we rent. Now since my middle brother is deceased, what happens with our parents home, does it revert to the 2 of us? Ex-sister-in-law will become conservator for her son. Is son is entitled to everything? My brother was financially well set. What are our legal rights? Also, can his ex-wife still serve as the executor of his estate, if he didn't update his Will or trust since the divorce?

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