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the granddaddy of them all
The biggest, oldest, most impressive, or most respected person or thing of his, her, or its kind. I own a lot of vintage cars, but my 1926 Bentley is the granddaddy of them all.
daddy of them alland granddaddy of them all
Fig. the biggest or oldest of all; the patriarch. This old fish is the granddaddy of them all. This tree is the daddy of them all. It's been here since the place was built.
granddaddy of them all
The first, oldest, or most respected of its kind, as in That computer is the grandaddy of them all. [Colloquial; c. 1900]
(grand)daddy (of them all)
n. the biggest or oldest of all; the patriarch. This old fish is the granddaddy of them all.