What do the music group Jackson 5 and Carpenters have in common?

Both the Jackson 5 and the Carpenters had famous sibling duos within their respective groups.

In the Jackson 5, Michael Jackson and his older brother Jermaine were the lead vocalists and frontmen of the group.

In the Carpenters, Karen and Richard Carpenter were the brother and sister duo that made up the core of the group, with Karen as the lead vocalist and Richard as the pianist, arranger, and composer.