(as) certain as death and taxes

(as) certain as death and taxes

Certain to happen; inevitable and unavoidable. A variation of the proverbial phrase, "Nothing is certain but death and taxes." They just aren't right for each other; they're certain as death and taxes to break up eventually. The two brothers will be forever at each other's throats, as certain as death and taxes.
See also: and, certain, death, taxes
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