Willed two negro slaves: Pol, (who is the wife of Nace) and the other her child called Gusta, as also the said Pols future increase that she may have hereafter to be paid him after the natural life of my wife Eleanor and myself at which death my last happen. But in case my said son shall die without lawful issue and before he possess the said negroes and increase thereof my will and desire is that the whole of them shall go to my daughter Mary Ann THOMPSON.

Will of John Baptist THOMPSON, b. 17__ d. 1814
Register of Wills, Charles County, Maryland
Volume HB #13 pp. 302 & 382

Possibly had a daughter named Margaretta.

In 1778 he subscribed to the Oath of Allegiance and fidelity to the State of Maryland before Magistrate George Dent. The 1790 Census shows him as head of the family in Charles County with two males under 16, two females and 25 slaves.

On February 3, 1810, he bought from his son-in-law and daughter, Clement McWilliams and Mary Teresa his wife, then living in St. Mary’s, a portion of “His Lordships’s Favor”.