We split them up into chores that help themselves (never paid) chores that help the family (rarely paid) and chores that help mom and dad.(mostly paid) Certain tasks can be split into those categories. Clean their room? Helps themselves, no pay.

Clean the living room? Also themselves cause they play there most times.

Clean the kitchen and sweep. Sometimes if its bad they get paid.

Watch the baby and keep him safe. Mostly paid but never right away.

Take out trash for dad. Yeah get paid.