He might could tell you.

source: 
COCA
Entry: 
1082
Example: 
You go on down to the next house down. Yella house sits back from the road. Real old man, he sits in the yard. He might could tell you. He's ninety-eight.
Modal 1: 
might
Modal 2: 
could
Gender: 
Female
Race/Ethnicity: 
Unknown
Age: 
unknown
Level of Education: 
Unknown
Home Community, Town, or State: 
Unknown
Location Collected: 
Fictional Story
Year: 
1993
Relation to Addressee: 
woman to man
Medium: 
Written
Sentence Structure: 
1.0
Status: 
Naturalistic
Notes: 
Source: Norris, Helen. 1993. 'The Flying Hawk' in Southern Review 29:1. (author is from Montgomery, AL) Full Context: dear, " said Miss Potts with patience. " I'm very anxious to find that inn or even the place where it used to be. An inn is something like a small hotel. I'm very sure it was close to here. " # The dogs whined in a lonesome way. The woman came to some sort of life. She dropped her hair and pointed her finger. " You go on down to the next house down. Yella house sits back from the road. Real old man, he sits in the yard. He might could tell you. He's ninety-eight. " # " Thank you, my dear. I'm indebted to you. " And Caleb saw Miss Potts blow her a kiss.... He felt that things were coming unglued, and would only get worse. He was sure of it. # Sure enough, the old man was out in the yard. His chair was under a sweet gum tree. A breeze was ruffling his snow-white hair. Miss Potts was really excited to see him. " I