...not udnerstanding dutch, but still a bit due to familiarity with german...
I cannot read or speak Dutch but I can understand it because my parents spoke Dutch at home. I once had a German school mate and one day he took me over to his place. Whilst we were messing about, his parents kept talking to each other in German. They were totally unaware that I could understand every single word that they were saying about me.
(In fact it was their son who was a terrible influence on me - but that's another story!)