Uncle in Japanese

"Thank you very much" would usually be "arigatou gozaimasu" (ありがとうございます・有難うございます) (present tense) or "arigatou gozaimashita" (ありがとうございました・有難うございました) (past tense). However, other expressions of thanks are possible, though not so common. Much depends on for what one wishes to express obligation.

"Auntie" would be "obasan" or "obachan" (おばさん or おばちゃん, respectively) if you want to be more or less formal, respectively.

The "auntie" part could be uttered before or after the "thanks" part.