Fair chore division rarely fails because nobody wants to help. It usually fails because the recurring work is vague, invisible, and easy to underestimate.
Start by listing recurring chores
People usually remember big chores and forget the repeating daily work. Make dishes, resets, laundry, trash, bathrooms, and room cleanup visible first.
Assign ownership, not vague responsibility
A chore is easier to complete when one person clearly owns it or when the shared rule is explicit. Ambiguity is what makes chores fall back on one person.
Review the split after a week
A fair split has to survive real life. Review who actually completed the recurring work and adjust from there.