I would not do any laundry if this is something that you usually don't do as a weekend babysitter. I would straighten up or do whatever you normally do. Ignore the list.

You say it's weekend care, but that you relieved her on Thursday? Can you clarify what the timing is, i.e. if you are relieving her part way through the childcare day on a weekday as well as doing weekend care? If so, do you think that she is purposely leaving them for you? Maybe you can let the MB know that you want to be clear on what she would like you to do when you are there and ask if she'd be able to let you know directly rather than via the other nanny.

Sounds like she's worried about getting into trouble for not finishing her duties. That doesn't make it your problem though

I would straight up tell the MB about the texts and let her handle it.

I would respond via text that you are a weekend babysitter - not the children's full-time nanny and that you will not be doing her job for her. By all means clean up the house like you usually would for a weekend job but don't do the nanny's list that MB left for her.

I would also save the text messages so if MB asks why certain chores aren't done you can tell her that the nanny didn't finish them prior to you arriving.

She's the one bring unprofessional, I'd tell her no and that you expect the house to be in order when you arrive since your just the babysitter. I would then explain to MB that while you have no problem straighten up, you won't do their nanny's job for her.

Mini rant: I'm doing weekend care for the family I nannied for for 3 years. They have a new nanny now, and she is really sweet, I don't have any issues with her. That being said, on Thursday when I relieved her, she left me a list of things that MB had asked her to do, that she hadn't done yet. I shrugged it off, said I'd take care of it. Whatever. But just now, I got a text from her asking tho make sure I did all their laundry and put it away, and could I please clean up the house before they got home. (Which, I always do, as a matter of fact, MB told me once that I'm the only one of their nannies or sitters who has always left the house in top shape after a weekend stay. She raves to her friends about how I always leave the house cleaner than it was when they left. It's just something I do, as a perk of giving me the job.) Anyways, I'm a little irritated with the nerve of this girl, thinking she can tell me what I should be doing, and the spiteful part of me wants to leave it all for her to deal with tomorrow. I won't, because I'm a professional, but it irks me that she sent me that text. What would y'all do? Would you feel peeved