Uncle Dan is an old Missouri tune that I learned from Junior Marriott. Junior’s the only person I have ever heard play this tune before, but I’m certain that it has some history to be uncovered. Anyway, it’s a fun tune, and it’s got a really nice danceable feel to it.
It’s a C tune with a strong A minor component, similar to Billy in the Lowground and Spider Bit the Baby, but the C (third) part of this song is really what sets it apart. It has a chord where you play 4th finger D on the G string along with a first finger E on the D string and a 2nd Finger C natural on the A string. It’s harder than it sounds. 
I haven’t been able to find any history on this tune, so if you have any info, please leave it as a comment on this post.
Update from Facebook:
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Jake Duncan Randy Elmore’s uncle wrote it
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Marty Elmore Yes, jake is correct. Our uncle Dan Dixon wrote it and named it. Randy embellished it and made it the tune that it is.
Good tune!