Eilish and her brother Finneas O'Connell collaborate on songwriting.[63][64] Eilish called Finneas her partner in making music.[63] He writes for her albums, produces her music and also performs with her on live shows.[65][63] Eilish and Finneas "like to completely make up things and become characters" and "have songs that are really fictional".[64] Eilish said a number of the songs also derive from her and Finneas' experiences.[64] They try to write "really interesting and conversational" lyric