Children |
| 1. Jacob Koops Mast, b. 1744, Giethoorn, OV, NLD |
| 2. Jochem Koops Mast, b. 1749, Giethoorn, OV, NLD d. 13 Jun 1824, Opsterland, FR, NLD (Age 75 years) |
| 3. Femmigjen Koops Mast, b. Abt 1754, Oudehaske, Haskerland, FR, NLD d. 12 Feb 1824, no. 62, Langezwaag, Opsterland, FR, NLD (Age ~ 70 years) |
| 4. Jantje Koops Mast, b. Abt 1760, Giethoorn, OV, NLD d. 06 Mar 1824, no. 63, Langezwaag, Opsterland, FR, NLD (Age ~ 64 years) |
| 5. Jan Koops Mast, b. Abt 1763, Giethoorn, OV, NLD d. 28 Apr 1835, huis 140, Tjalleberd, Aengwirden, FR, NLD (Age ~ 72 years) |
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