Onyx - I would as I think that kids are pretty cluey and generally have some insight into how things are regardless of how good a front the grown ups put on it. Perhaps keeping things simple with clear examples of behaviour that would help out will make it easier for them. I would also try and check in with them of an evening and try to positively reinforce their help.
Can you get some other help to take the pressure off? Strategies to assist with the housework/cooking etc so you can keep all that together as well as being mum?
xx