Why don't you just tell me who is who?

Logic Level 3

In a small village there are 4 families. Interestingly, each family has a pair of twin sisters. Let the elder sisters be ABCDABCD and the younger sisters be abcdabcd. One day, you went to the village and saw 8 of them and asked, "Which family are each of you belong?"

AA says, "BB and aa are not twin sisters."

BB says, "CC and dd are twin sisters. "

CC says, "DD and cc are not twin sisters."

DD says, "Among ABCABC, only the elder sister of dd is telling the truth."

Given that DD is telling the truth, can you know which two are a pair?

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