"Hvorfor er jeres forældre underlige?"

Translation: Why are your parents strange?

[Niramu]

Can odd not work in this context? I was marked off for it...

[celticstorm73]

Surely weird should have been allowed?

[Fred-3-CMY]

Clearly related to German "wunderlich", though the word is less frequently used nowadays and replaced by "seltsam, sonderbar, merkwürdig, schräg, bizarr, komisch etc.").

[Jana63110]

Thanks! I was struggling to memorize underlige. Now I have a donkey bridge ;)