Translation:Parents are responsible for the safety of their children.
Shouldn't this have been right? The parents are responsible for their children's safety.
Elsewhere "su/sus" is translated as "its/his/her/their own" when it is understood that "sus" refers to the same person/persons as the subject of the sentence. Here, it is not allowed. Is there a more subtle rule for when to translate "su/sus" as "its/his/her/their own", or is Duo just inconsistent about this?