How much of other dialects do you understand? For example, could you listen or read Low German, Rhenish or even Dutch? Where would you draw the line? Also, could you understand other Germanic languages, like Norwegian, Swede or Danish?
For instance, my mother tongue is Spanish (or more accurately Castilian), but I can understand Portuguese, Italian or Catalan almost without any trouble. French and Romanian are a lot harder to understand, though. Would you say something similar happens to Germanic languages?