Willem the Silent is widely considered to be the father of the Netherlands, but I have found that he was born in Nassau, Germany, which was then part of the Holy Roman empire. His ancestors were born in the Netherlands, but would it still be considered sensible to consider him Dutch AND German?
Why am I asking this? Let's look at an example of an opposite case. Nobel prize winner Wilhelm Röntgen was born in Germany, but his parents were Dutch. He still is considered a German. He even lived in Netherlands for almost his entire youth. Yet still he's considered German. This is just an example, don't try to base your answer off of this reply.