Children:
- Tjerk Piers was born about 1746 in Mantgum, Baarderadeel, FR, NLD.
- Grietje Piers was born in 1749 in Mantgum, Baarderadeel, FR, NLD.
- Nanne Piers Swierstra was born in 1750 in Mantgum, Baarderadeel, FR, NLD; died on 27 Jan 1826 in no. 23, Mantgum, Baarderadeel, FR, NLD.
- Klaas Piers
- Aijse Piers Swierstra
- Gerben Piers Swierstra
- Wintje Piers Swierstra died on 15 Mar 1814 in Mantgum, Baarderadeel, FR, NLD.
- Trijntje Piers
- 2. Johannes Piers Swierstra died on 16 Mar 1845 in Baarderadeel, FR, NLD.
- Geertje Piers
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