Matthew and Kay McConaughey in 2012. (Michael Buckner/Getty Images for SXSW) Matthew McConaughey’s mom, Kay McConaughey, is getting candid about marrying the same man — three times. Kay, 93, opened up about Matthew’s late father, Jim McConaughey, in a recent interview with Austin Lifestyle, addressing their unusual marital history: They were twice-divorced and thrice-married to each…