Make a list of what needs to be done to be finished. Type it up, print it off and post it in the room.
Like this:
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The table is to be cleared of dirty dishes and they are to be stacked by the kitchen sink.
The dining room table is finished when it has been wiped clean and not particles of food remain. The chairs are to be wiped out to remove all food particles too.
The floor is to be swept and all food or drink spills are cleaned up. If there has been food or drinks on the floor it should be mopped up.
The shelves and cabinets need to be dusted and cleaned of any food drips.
The plants need to have a small drink.
The dining room is finished:
when the dishes have been taken to the kitchen, the book shelves have been dusted, the table top is clean and shiny, the floor has been swept and any sticky residue is cleaned up, all plants have had a little drink.
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Post this inside a cabinet in the room so they can peek at it to check it off. This way they can check and see if they did it all.
Put one in every room of the house. That way anyone can do that room to your standards each and every time.
She will need a companion for the first few weeks or so to learn the most effective way to do these new chores. If the dad works with them so mom can have a rest time it reinforces that mom works hard too and deserves to have a break.