Agrelon

HasRelative

https://d-nb.info/standards/elementset/agrelon#HasRelative
Has subclass: has cousin, has in-law, has aunt or uncle / niece or nephew, has ancestor / offspring, has sibling

has cousin and has sibling could be combined as sibling could be seen as zero grade cousin

HasInlaw

https://d-nb.info/standards/elementset/agrelon#HasInlaw
Label (German)	hat angeheiratete(n) Verwandte(n)
Has subclass: has child/parent-in-law, has fiancee or fiance, has sibling-in-law, has spouse

false, as "fiancee or fiance" (Verlobt) is not a subclass of "angeheiratet"

HasBiologicalChildParent

https://d-nb.info/standards/elementset/agrelon#HasBiologicalChildParent
Has subclass:	has illegitimate child / parent

A class with just one subclass: how to identifiy a biological child/parent, that is not illegitimate?