Maria Cornelia was die dogter van Phillip Nel en Susanna Maria Botha.
Friedrich Greef van Bronswyk was van beroep junior apteker, toe hy op 31 Augustus 1788 in die eg verbind is met Sara Helena Smit. Vier kinders is uit die huwelik gebore. Die oudste hiervan was Hendrik Willem Greeff wat met Cornelia Dorothea Lotter getroud is. Op 16 Junie 1844 trou hulle seun Mattheus Johannes Greeff met Maria Cornelia Nel.
(http://www.greeff.info/tng01/showmedia.php?mediaID=484)
Kinders:
d.1. Susanna Maria GREEFF, geb. 21/04/1845, ged. 22/06/1845, Somerset-Oos × Jan Jonathan Du Randt, geb. 1840.
d.2. Dorothea Cornelia GREEFF, geb. 29/02/1848, ged. 22/03/1848, Somerset-Oos × 03/07/1856 met Cornelis Wilhelmus Erasmus, geb. 24/01/1848, ged. 30/04/1848, Somerset-Oos, s.v. Willem Petrus Erasmus en Gesina Cornelia Els
d.3. Maria Cornelia GREEFF, geb. 29/02/1848, ged. 22/03/1848, Somerset-Oos x Piet du
Randt.
d.4. Johanna Maria Cecilia GREEFF, geb. 29/10/1849, ged. 25/12/1849, Somerset-Oos x
02/04/1867, Somerset-Oos met David Hercules Nel.
d.5. Willem Hendrik GREEFF, geb. 04/06/1851, Verstokenfontein, ged. 03/08/1851, Somerset-Oos, oorl. 05/06/1909, Kruisementfontein × Louisa Franscina Holtzhausen, geb. 1852, oorl. 11/02/1907.