Family Babysitting??

I would tell her exactly what you just told us. You already have her on a good schedule with 2 people watching her and a third person (besides her parents) would be too much. Offer her to come and visit or take her to the park for an hour or two whenever she'd like but you already have sitters and you'll let her know if you need her in the future to babysit.

Does your mother-in-law watch her 1 day a week because she wants to spend time with her or because the other sitter can't watch her more than 3 days a week? If possible, I'd have the sitter watch her more often since she's doing such a great job with her. Family members can visit your daughter and take her out for ice cream or something whenever they'd like.

Either way, if the system isn't broken don't try to fix it, so to speak. Be honest. Raising your child the best way you feel is right comes before worrying if you hurt someone's feelings. I'm sure your SIL will be fine with it especially if you offer her other options to spend time with your daughter.

K. B
mom to 5 including triplets

Just tell her thanks but right now you think things are flowing very well but if things change you will let her know.

...And that you'll be glad to keep her in mind as back up.

Maybe your mother in law and sister in law can trade off weeks, that way everybody is happy. Otherwise, just let her know that as much as you appreciate her offer, everything is working out really well and you will have to decline.

I would just be real nonchalant about it and say something like "Oh, we have someone that watches her and we're happy with her. Thank you anyway!"

And then leave it at that.

Just tell her that you don't want to make another change in daycare arrangements right now because your daughter has just gotten used to the current arrangements and you don't want to throw a wrench in the works.

I would ask SIL if she wants to be your backup sitter, as DD is doing really well with the current schedule. If she just wants time with her niece, she can give you a date night (or date afternoon) or just come for a playdate with the cousin on a weekend.