LOS ANGELES — The edgy, avant-pop album that siblings Billie Eilish and Finneas created in a small bedroom made a big splash at the 2020 Grammy Awards, winning 11 honors for the musical family. “When We All Fall sleep, Where Do We Go?” — created in the musicians’ Los Angeles home — helped Eilish win the top four honors, including album, song and record of the year, along with best new artist.