Here's some info about the Fleet's from The History of Printing in America: With a Biography of Printers, Volume 1:

Thomas Fleet, Jr., & John Fleet. They were brothers, and having learned from their father the art of printing, succeeded him in business at his house in Cornhill, in 1758. I mention them together, because they commenced printing in partnership, and continued in connection until separated by death. They carried on the publication of The Boston Evening Post until the commencement of the revolutionary war; when they suspended the publication of that newspaper, and it was never after resumed. The impartiality with which the paper was conducted, in those most critical times, the authenticity of its news, and the judicious selections of its publishers, gained them great and deserved reputation.

Both brothers were born in Boston. Their father gave them a good school education; they were correct printers, very attentive to their concerns, punctual in their dealings, good citizens, and much respected. They printed several works in octavo, and some volumes in duodecimo, on their own account; and some in connection with other printers. Their shop was always supplied with smaller articles for the benefit of their sisters, who were never married.

They remained in Boston during the siege; and, afterward, revived the publication of the Massachusetts Register, which originated with Mein and Fleming some years before, and had been continued by Mills and Hicks. Thomas died a bachelor, March 2, 1797, aged sixty-five years. John was married; he died March 18, 1806, aged seventy-one, and left several children; one of whom, by the name of Thomas, was a printer in Boston at the same house in which his grandfather began the The Boston Evening Post[1].


1. Ann Fleet, the daughter of John, and the last of the name, died in Boston, July, 1860, aged 89. The estate of Thomas Fleet Sen., at the northerly corner of Washington and Water streets, which he purchased in 1744, and from which the Etening Post was issued for upwards of thirty years, still remained in the hands of his descendants In 1860, although they had discontinued the business of printing in 1808.— Boston Transcript. Thomas Fleet Sen. was the putative compiler of Mother Goose's Melodies, which he first published In 1719. Among the entries of marriages in the City Registry, under date of June 8,1715, is that of Thomas Fleet to Elizabeth Goose, and the idea of the collection is said to have arisen from hearing his mother-in-law repeat nursery rhymes to his1 children. It was characteristic of the man to make such a collection; and the first book of the kind known to have been printed in this country bears his imprint, and the title of Songs for the Nursery, or Mother Ooose's Melodies for Children. The name of Goose is now extinct in Boston, bat monuments remaining in the Granary burial ground in that city mark tho family resting place.— M.

Richie