I very much enjoy spending time with the children on evenings I do not have school and when you work on the weekends, and would like to continue to do so. Let me know if this becomes an issue for you."
The ONLY thing I would caution about this...
Is that it CAN be a potential for her to see this as "cake-eating" from you.
Really take some time to think about this, and what it really means to you. Maybe this could be what your Sister was speaking of, that after time you could ease into things again.
I'm not saying that it is a bad thing, just dance around that very carefully....
YOU are setting boundaries against cake eating, and if SHE sees this as being what you are asking for, it could backfire very quickly.
Her hypocrisy can have zero limits, just make sure you are air tight..
