Children:
- Froukje Piers de Groot was born on 17 Jul 1786 in Raard, Westdongeradeel, FR, NLD; died on 28 Apr 1868 in Dantumadeel, FR, NLD.
- Dieuwke Piers de Groot was born about 1788 in Raard, Westdongeradeel, FR, NLD; died on 22 Dec 1827 in Dantumadeel, FR, NLD.
- 1. Johannes Piers de Groot was born about 1791.
- Hinke Piers de Groot was born about 1793.
- Pieter Piers de Groot was born about 1795.
- Maaike Piers de Groot was born about 1798; died on 14 Apr 1848 in huis 11, Foudgum, Westdongeradeel, FR, NLD.
- Antje Piers de Groot was born about 1801.
- Tijtje Piers de Groot was born about 1803.
- Ebeltje Piers de Groot was born about 1804.
- Pier Piers de Groot was born about 1807.
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