Drummond, on Jean de Vos (Francomme) and Suzanne de Vos. It is interesting to note, under Suzanne de Vos' sources, June Barnes added a copy of a chapter (9 - From Flanders to Alsace) from Boucher's "French speakers at the Cape in the first hundred years of Dutch East India Company rule".
This is interesting as it mentions the various Huguenot families that arrived in the Cape.
More specifically, a Jean Francomme is mentioned on page 252 merely to say that Jean Nourtier was godfather to Susanne, daughter of Jean Francomme. Francomme's son, also Jean, became an elder of the Dover church and was still living there when the last service was held in 1731. It may be inferred that Jean Francomme is most likely a man and one possible reason why there seems a disconnect now that we have documentation on Suzanne de Vos, specifically connected to Pierre Jacobs.
Also on page 252 it mentions that the Jacob family arrived in the Cape in 1688 from Guines. Pierre Jacob was married to Susanne de Vos, of Flemish stock, and both families were from Vieille-Eglise. It notes that there were also other Vos and Jacob families in Calais.
One other Vos family it mentions lived in the hamlet of Nouvelle-Eglise, and another Susanne de Vos became the wife of widower Jean de Bus July 28, 1680. A Jean de Bus sailed on the Oosterland in 1688 and could be the same, but as the name is frequently encountered in the Guines registers, it cannot be confirmed. Here certainly is another Suzanne de Vos, and further evidences the problem with adding and merging without actual paper evidence confirming that these are the same Suzanne de Vos'.
Page 253 notes that Pierre Jacob and Suzanne de Vos brought three children to the Cape: Susanne (Sept 9, 1671), Daniel (Sept 14, 1673 and Sara (Oct 7, 1677).
Naturally, the book has the various references on their research - which I understand is quite extensive.
