A few from musical theatre:
The Muellers - Jessie, Abby, Matthew and Andy. Jessie and Abby both played Carole King in Beautiful.
The Strallen sisters - Summer, Scarlett, Saskia and Zizi. Scarlett and Zizi have also shared a role, both having played Mary Poppins.
The Keenan-Bolgers - Andrew, Celia and Maggie.