The Pick-Pocket

The Society of Identical and Unmarried Triplets of Berkeley was holding their annual party one evening at the Hillside Club when $200 was stolen from a guest’s wallet. The wallet was carefully slipped back into the guest’s pocket without the guest noticing. Later in the evening, the guest opened the wallet to show someone a photograph and discovered the money was missing.

Seven sets of triplets arrived at the party, ranging in age from three months to very elderly.

The Suspects:

1. the Appletons
2. the Brinxes
3. the Carlyles
4. the Drabbles
5. the Entenmans
6. the Floods
7. the Gingers

Clues:

1. In order to attend the party, all three triplets in a set had to arrive at the same time. If only one or two triplets from a set arrived, they would be turned away.
2. No one but triplets was at the party.
3. Earnest Entenman was a collie who had won a medal for finding a lost child last year.
4. Everyone arrived in threes except for the Appletons and Carlyles who arrived together.
5. The Gingers, who were large and stout, turned around as quickly as they could at the door and fled home when they saw the Entenmans were at the party.
6. Alice Appleton was in a very good mood because she had just received her Ph.D. in math from U.C. Berkeley. She was the youngest person ever to receive a Ph.D.
7. The Drabbles arrived early.
8. The Brinxes told the guests that they had had their retirement party at the same club, twenty years ago.
9. The Floods were the uncles of the Appletons.
10. The pickpocket was fifty years old.

What was the pickpocket’s last name?