Lyric discussion by terri1909 

Cover art for Sister lyrics by Mumford & Sons

Definitley about his sister, and a song I can identify with.

I don't even think his sister necessarily wants to 'leave', more that she's just going through a challenging stage in her life, which all of us with sisters, particularly younger sisters can identify with.

The 'chip on your shoulder' he talks about I think is referring to teenage angst and a general grievance with or grudge against life, which anyone who has been a teenage girl can relate to. And if she doesn't let it go she will push everyone she knows away. And eventually her roots (referring to her family) will rot away, and her fruit won't grow (she won't flourish and blossom, or reach her potential with this chip on her shoulder).

And he asks her not to 'test' the one's she loves, letting her know that she might just push them too far and he asks her to find other ways of feeling alive instead of releasing her aggression on the one's that love her. If she wants to feel alive she should learn to love herself and what she stands for.

I absolutely love this song and have to stop myself quoting it in arguments with my own sister!!