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Barry Bostwick (born February 24, 1945) is an American actor and singer who voiced Thunderbolt in the 2003 Disney direct-to-DVD film 101 Dalmatians II: Patch's London Adventure and Grandpa Clyde in the Disney Channel animated series Phineas and Ferb. He also played Big Poppa in Teen Beach Movie, Mr. Bradley in Hannah Montana: The Movie and Jeffrey Wyatt in The Parent Trap III and its sequel The Parent Trap IV: Hawaiian Honeymoon.