Anna Maria de Windt

• Anna Maria was living at Sparkill when the negotiations of the details of the peace took place at her family's estate. Read: deWint House - Evacuation Day and Wikipedia on this de Windt house that she inherited form her father. This house later served as a Gen. Geo. Washington HQ and was the site where the details of the so-called Evacuation Day (NYC) were finalized.

The de Win(d)t family came form a planter background in St. Thomas in the West Indies and therefore had slaves.

tracing the family of one of their slaves, a girl named Tun

We should look carefully at the will of Johannes de Win(d)t. It was proved after the slave girl Tun was born. Do we see any candidates for a parent of Tun?
In particular: Frederic's dau. Anna Maria got his farm called Sparkill at Orange Town.

Anna Maria died before he father's will was proved. It would be common sense that this is why Tun was not given to her but to Anna Maria's (only?) dau. Ann.

notes

1. Friday, November 3, 2017 at 7:30 pm • DeWint Carriage House • 52nd Annual Meeting •The Tappantown Historical Society invites you to the Society’s 52nd Annual Meeting on Friday, November 3, 2017, at 7:30 pm in the DeWint Carriage House. There will a brief business meeting, which includes the President’s Annual Report, the Treasurer’s Report, and the election officers and directors.
2. http://dewinthouse.com/evacuation-day "Washington recommended to Sir Guy Carleton that a meeting between their staff be held to lay the ground work for a general exchange of prisoners at the De Wint house on September 27, 1782. Representing Sir Guy was General Campbell and Andrew Elliot (who was to take over as NY’s Tory lieutenant governor for a short time) and General Washington sent Generals Heath and Knox. Washington had met Andrew Elliot before in Tappan two years earlier when Sir Henry Clinton had made one last try to save Major Andre from hanging; Elliot was one of the team sent to plead with Washington."
3. see section on the De Wint house
4. http://dewinthouse.com/ "The DeWint family, from the West Indies, owned the house from 1746 to 1795, which covers the period when Washington visited."