The phrase "his posterity" is correct and usable in written English.
It is typically used to mean the descendants of someone in the future. For example, you could say, "The legacy of his work will be cherished by his posterity for generations to come."
Pete Seeger, who died yesterday, at ninety-four, linto into his posterity.
Brahms planned his posterity, not only by destroying his failures but also by belittling his contemporaries.
But it has been his earlier incarnation to which his posterity has somehow clung: to Malcolm's own slayer, in effect.
Before that time, the individual had to be content that his posterity continued within the holy nation.
It is the first clear ownership of a piece of the promised land by Abraham and his posterity.
By Alec Wilkinson January 28 , 2014Pete Seeger, who died yesterday, at ninety-four, linto into his posterity.
The blame for this entire trams debacle can be fairly laid at the feet of this deluded individual who has tried to make his mark on Edinburgh for his own posterity and his elevation in the Labour Party, which is now as likely as getting this tram system for under a billion quid by the end of 2015.
His hope, as Mr. Spence puts it, was that "because of his honesty, posterity would revere his name".
In his poem "Posterity", for instance, he imagines Jake Balokowsky, his fictional biographer, musing over the character of his subject: "'What's he like?
He says it is his masterpiece, his pitch for posterity, and it is his, all his.
He was the official photographer for the school district, for the wedding circuit, for commissioned portraits and civic events and for his own posterity.
