'direct offspring' is correct and can be used in written English.
It is often used to refer to a person's direct descendants - the children, grandchildren, and so on. For example: He was proud of his direct offspring, who had all gone to college.
One cannot cast dispersions on modern culture, which is nothing more than the direct offspring of the past.
Examples abound, beginning with the Miles Davis Nonet (1948 50)—a direct offspring in instrumentation and musical intent of the Thornhill band.
In much the same way as I still cannot believe Eddie Izzard ran 43 marathons in 51 days – a feat that should not be possible unless you are the direct offspring of Atalanta herself – I still cannot believe that David Walliams swam a) the Channel (in 2006) or b) 140 miles of the river Thames (last year, for Sport Relief).
The first of them, "A Fistful of Dollars" (1964), was the direct offspring of Akira Kurosawa's "Yojimbo," which, in turn, was a first cousin once removed of Dashiell Hammett's "Red Harvest," a novel whose protagonist, with a heart like a corn husk, was known only as the Continental Op.
The helping traits are preserved and proliferate through relatives, not direct offspring: kin selection.
As you may tell, this whole piece is the direct offspring of having just opened my own, personal Pandora's Box of emotional baggage.
Bertrand Russell thought CND was too moderate and resigned to create its direct action offspring, the Committee of 100.
Because we and we alone direct our offspring to a separate and gnarled branch of the food supply; because only we embrace the lamentable lie that kids should eat something other than real food, that multicolored marshmallows are part of a complete breakfast.
Wilson and his assistants, Zinsser knew, were the direct spiritual offspring of the Darwinian period; they had known Haeckel and Huxley.
This included the 19-year-old dam (dam J) of bulls A, B and C, bull B, 255 direct female offspring of bulls A, B and C and eight other direct (n = 5) and indirect (n = 3) female offspring of dam J (Table 1).
"There are differences, of course," he says, "since biological evolution has the direct parent-offspring relationship, and we don't know the mechanisms even in biology.
