More sister and brother acts
From the 1930s, the Brown Sisters:
[youtube]http://www.youtube.com/watch?v=qIdEtnWB1jg[/youtube]
From the 1940s, the King Sisters:
[youtube]http://www.youtube.com/watch?v=EE69jBxZuXg[/youtube]
From the 1950s, the Mills Brothers:
[youtube]http://www.youtube.com/watch?v=txGEMeZEUGc[/youtube]