Once-Ler's Uncle UbbThe Once-ler's uncle is the patriarch of the family. He pushes a load of Truffula leaves that Bret and Chet harvested while obeying the Once-Ler's request that no trees be cut down. Like Bret and Chet, they seem to be sorta under the control of the women in the family. Like the rest of his family, he's obviously greedy and money-hungry. As seen during the song "How Bad Can I Be? ", he is a part of a false scheme to draw more money, faking being a hobo so that it would seem like the Once-ler was giving money away to charity.
Bret and Chet
Bret and Chet are The Once-ler's twins and stupid, older brothers. They help pull out the tree's leaves and cut down the trees. They appear to like playing football with the Barbaloots. The brothers were shocked when their mother suddenly named Bret her new favorite child.
Once-Ler's Mom Isabella
She helps cut down the trees and is the mother of Bret, Chet, and Once-Ler. She is snobby, money-crazy, selfish, cruel, abusive, and somewhat manipulative to her youngest son. She constantly belittles Once-Ler, and was said to have said he wouldn't amount to anything all his life. She is the one who convinced Once-Ler to continue cutting down the trees. Mostly its clear that she wants Once-Ler to make the business more successful to keep her well kept. Once the last one falls, she says that she is disappointed in Once-Ler and names Bret as her new favorite child.
Once-ler's Aunt Grizelda
She dislikes the Lorax for calling her names and refers to him as a "giant, furry peanut." The Lorax was greatly surprised when Once-Ler told him she was a woman. Like most of the family, she cares only about money with no regard for Once-Ler's feelings. She demonstrated an example of her cruel and treacherous nature as she tossed the Lorax aside when he tried to remind the Once-Lers of their promises to never chop the trees down.
- The Once-Lers Mom, Isabella, wears the same bow from a character who has the same name from Phineas and Ferb.