Petrus Johannes was die seun van Pieter Willem Nel en Jacoba Catharina Fick.
(https://www.myheritage.com/person-5015333_148888701_148888701/petrus-johannes-nel)
(https://www.myheritage.com/person-5015340_148888701_148888701/johanna-margarieta-nel-gebore-brandsma)