bathe in reflected glory
To experience or enjoy fame only through one's association with a famous or successful person. As the sister of the superstar, for years she bathed in reflected glory, until she finally got her own shot at fame.
bathe/bask in reflected ˈglory
get attention and fame not because of something you have done but through the success of somebody else connected to you: She wasn’t happy to bathe in the reflected glory of her daughter’s success, as she wanted to succeed on her own.