Some of the people named in this 1687 document are familiar to me: - Casper Steiffgen/Steichen (b 1560) & Marguerite Rackandals (b~1565) were husband and wife (both certainly dead at the time of the document); - Maria Franck (b~1660, m. to Mathias Gallus), - Eve Franck(b 1660, m. to Balthasar Crutz), - Elis. Franck (b~1660, m. to Jean Kauffman) were gr-granddaughters; - Madeleine Steichen (b 1665, m. Henry Stourm) was a gr-gr-granddaughter; - Susanne Steichen (b 1617), is a granddaughter to Caspar, mother to the Franck girls, but I have no record of her being related to a George Niclaus Haupert (of course, the document does not actually say she was); - Johann Steichen could be a grandson, gr-grandson or gr-gr-grandson (it is not clear from the context). The other names are not known to me.
What is not clear to me is who sold and who bought... my best guess is that it was the Terver and Hipper couples buying and the grand and great-grandchildren of Caspar selling. Do you agree?
If that, then I'd surmise that Caspar Steiffgen/Marguerite Rackandals and Susanne Steichen are mentioned merely to indentify the land (again I don't know how Haupert links into this land).