The second son of Peter Debohr [], Isaac []- a trained 'Weinverlasser'' (wine dealer) - leaves Hanau and moves to Hamburg. There, on 20may1731, he weds, as Isaac de Boor, in the German-protestant-reformed congregation, Anna Metta Meyer. Isaac enrolled on 15.06.1737 in the Register of the `Axt & Weinverlasser', signing there as Isaac Deboor. By then, he already had four childen, the oldest, Johann Abraham []; after that, Jakob Hartwig; b. 1734; then Johann Isaak and Johann Jakob who, for unknown reasons, emigrated. One took his violin to America, the other moved to Russia. Three additional children grew up in Hamburg: Sarah Katharina, b. 1738; the youngest son Johann Friedrich [] who became co-founder of a "Hamburger Gesellschaft zur Förderung der Künste und nützlichen Gewerbe" - Patriotische Gesellschaft von 1765 - (Hamburg Society for the Arts and Useful Crafts); the final one, Anna Maria, b. 1742, and married since 1766 with the Hamburger Jochen Erend Baldewein.

The oldest son Johann Abraham de Boor is drawn away from the city, he becomes "Hannöverscher Kriegscommissär im 7jährigen Kriege (1756-63) wobei er wohl reich geworden war, denn er kam mit großem Aufwande z.B. vierspänniger Equipage und Mohren nach Hamburg. Hier wurde er Weinhändler, machte aber unglückliche Geschäfte, und wurde deshalb Buchhalter bei Voght u. Sieveking."
(a Hanoveranian war commissioner during the Seven Year War (1756-63) whereby he may well have become rich, for he came to Hamburg in high style, e.g., in a equipage with four horses and with moors. Here he became a wine merchant, but made some bad deals and, because of that, became bookkeeper with Voghts and Sieveking.)
In November 1766, Abraham de Boor marries Marie Elisabeth Timmermann [], offspring of a well-off Hamburg businessfamily. Her artistic talent and acquaintance with the painter Johann Heinrich Tischbein the Elder, who had painted a portrait of the family Timmermann already in 1758, led her to the Kunstakademie in Kassel. The diploma she obtained there in 1780 along with an honorary membership in the academy may well have helped her in Hamburg after her return there. Marie Elisabeth de Boor [] became a well-appreciated portraitist of the Hamburg high society.
Her husband's work for the trading firma Voght and Sieveking was also successful, as can be seen by the fact that he was sent by the Hamburg business man and benefactor Johann Caspar Voght to Philadelphia. In the Congress there, he handed over in person a message from the Hamburg Senate to the first elected government of the United States. It was Hamburg's official congratulation on the occasion of the American independence.

The three children (Johanna [], Charlotte [] und Carl Friedrich []) didn't have much of their father, for "Nach der Rückkehr wurde er trunkfällig in eimem solchen Grad, dass er in Iserlohn in Pension gegeben werden mußte" (After his return, he became an alcoholic to such a degree that he had to be put into a home in Iserlohn.)
According to the Family Chronicle, the American ambassador and later president of the USA John Quincy Adams during a Europe trip asked for the hand of Johanna Cornelia de Boor [], "dies aber von den Verwandten nicht gebilligt worden, und so die Sache nicht zustande gekommen sei. Dies scheint sie sehr verbittert zu haben so daß mit ihren Verwandten und besonders Geschwistern gar kein, vielleicht selbst ein feindliches Verhältnis bestand."
(but this was not approved of by her relatives and so nothing came of it. This apparently has made her very bitter so that there were no or, perhaps, even hostile relations with her relatives and especially with her siblings.)
The youngest child, Carl Friedrich [], studies law in Göttingen when the father dies in 1799.