im not too sure what nationality
"
1. the state or fact of being a citizen of a particular nation
2. a body of people sharing common descent, history, language, etc; a nation
3. a national group: 30 different nationalities are found in this city
4. national character or quality"
So, I have to say we have a lot of multinational people on this site, so it's a little weird so few seem to be bilingual.
Anyway, I am born in Denmark, my family is Danish, so I have to say I am quite the Dane.
As for ancestry and family history, which might be the real topic here (which is pretty hard to tell when the opening post is spam), I have a rather Danish family line, though I think there might be a small ounce of German in me too, and of course, further out, other Scandinavian, Northern European and so forth ancestors, but as far as a smaller family tree is concerned, it's mainly Danish.
Not very interesting, of course, but makes for quickly getting a nice lobster red colour in the summer.