What is Fränk and Andy Schleck's native language?

Question

I know that they come from Luxembourg, where you talk Luxembourgish, German or French.

I have heard them speak both French and German, but I can't figure out what their native language is.

They probably speak Luxembourgish :)

Answer 1

As with most Europeans the Schlecks are multi-linqual.

Luxembourg recognizes all three of the Languages you mentioned as their official language.

Along with that three, English is cumpulsory in their schools.

Answer 2

french