Following up my previous questions on the usage of the word / phrase ('banzai' and 'ring the cherries') in Thomas Harris' thriller, ”The Silence of Lambs,” I came across the following passage in the scene Stacy Hubca, an office clerk of Franklin Insurance Agency in Belvedere, Ohio answers to Clarice Starling, an FBI agent.
“She died. She went to Florida to retire and she died down there, Fredrica said. I never did know her. - - - You might could talk to her family or something. I’ll write it down for you." - ibid Chapter 54. Page 332.
As an only school textbook-based English language learner, it’s my understanding that an auxiliary verb (might) should be followed by a root of verb. What is the grammatical justification of the sentence, “You might could talk to her family or something”?
Though it "might could" be a midwest dialect, but what’s wrong with simply and normally stating “You might talk to her family” or “You could talk to her family”?