Sugulus (2 sugulussuhet)
Robertus Petrus Martinus Gerardus Schipper on
Petrus Theodorus Schipper nõbu.
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Muidugi,
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Hendricus Maria Johannes Schipper
(1 sugulussuhe)
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Clazina Johanna Verhage
(1 sugulussuhe)
on samal ajal
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Petrus Theodorus Schipper vanavanemad
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Robertus Petrus Martinus Gerardus Schipper vanavanemad