Maria Post was the only wife.
I edited the profiles for Jan Albertse Bradt and Geesje Jans to include information about an error that was revealed in 1949 -- and that permeated previous published genealogies for this family. In short, Jan Albertse Bradt had only six children, none of them with Geesje. Geesje was married to a different man named Jan Albertse Jansen.
This was reported by Donald Lines Jacobus, the accomplished genealogist who introduced scholarly research into American genealogy, based on correspondence from Innes Getty, who did a goodly amount of excellent work on genealogies of New Netherland families. We should not be embarrassed to stand on the shoulders of these giants.
Jacobus and Getty said that the name of the wife of Jan Albertse Bradt was not known, but that has changed. I see that Pat Wardell reported a marriage record that identifies his widow as Maria Post. Specifically: "Eduwart Carbert, y.m. b. England, living Albany and Maria Post, widow of Jan Brat, b. Brazil, living Albany. Married 26 Nov. 1699" in Albany. So that record needs to be cited and discussed as the basis for identification of Jan Albertse Bradt's wife -- and it would be nice to toss some credit to Pat Wardell for finding it. Pat Wardell lists the 6 children that Innes Getty identified for Jan Albertse Bradt, plus three earlier children; she doesn't say how she knows the earlier children were Jan's.
PS - Please don't refer to Pat Wardell's work as "Bergen County records." That threw me off, since I've seen nothing suggesting that these people lived in Bergen County. Her excellent research was posted on the Bergen County genealogy society website, but it's the personal work of a genealogist that has very little relationship to Bergen County church records or public records. Give credit to the lady who did the work, not the county she lived in!