Sugulus (2 sugulussuhet)
Ronaldus Petrus Antonius Sewalt on
Johannes Arnoldus Everardus Sewalt vend.
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Muidugi,
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Arnold W. Sewalt
(1 sugulussuhe)
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Clazina Elizabeth Schipper
(1 sugulussuhe)
on samal ajal
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Johannes Arnoldus Everardus Sewalt vanemad
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Ronaldus Petrus Antonius Sewalt vanemad