He was demented likely since birth.

I don't know when dementia set in. He always said ignorant things so it is hard for me from the "outside" to know exactly. But, by 2008, he was mostly gone. He had no idea who most of his relatives where.

He still remembered his main antagonist. My cousin tried to get my dad and him to reconcile and my dad agreed, but once my father got within his recognition zone, my uncle went into a standard diatribe.

His lasting legacy is that he split the family.