Read the text and determine if the sentence is true:

Boban Rajovic (] , born 25 December 1971) is a Danish-born Montenegrin singer popular in former Yugoslavia. Some of his big hit songs include "Usne boje vina" ("Lips the Color of Wine") and "Provokacija" ("Provocation".) He has lived in Belgrade since 2000.

Sentence: Boban's twin sister was a popular singer in former Yugoslavia.
It's impossible to say