Sugulus (2 sugulussuhet)
Ian Melvin Schipper on
Petrus Martinus Schipper nõo poeg.
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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 Martinus Schipper vanavanemad
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Ian Melvin Schipper vanavanavanemad