I remember reading one example of this in an interview with the Swedish translator of the Harry Potter books. At some point a grandmother (I believe Neville's)

I remember reading one example of this in an interview with the Swedish translator of the Harry Potter books. At some point a grandmother (I believe Neville's) is mentioned. In Swedish, it is impossible (at least while sounding remotely natural) to say "grandmother" without specifying whether it's the maternal or paternal grandmother. The translator had to just guess, and ended up being wrong when more context was given in a later book.