Only Hearts Club Li'l Kids
There are seven Sister sets featuring a full size older sister and a younger Li'l Kid sibling. My favorites are the fantasy sets of the princess and mermaid outfits.

Olivia Hope
& Kristy
Lily Rose
& Jessica
Hannah Faith
& Chelsea
Karina Grace
& Melody
Taylor Angelique
& Trevor
Olivia Hope
& Kristy

Kayla Rae
& Sydney