Mental load at home usually comes from being the person who remembers, checks, notices, and follows up on recurring chores.
Name the invisible work
Mental load often includes planning, checking, and noticing, not just physically completing the task.
Externalize recurring tasks
Putting recurring work into a shared system reduces how much one person has to carry mentally.
Review patterns instead of assumptions
A shared view of chores makes it easier to talk about the actual system instead of arguing from stress.