I think you should also speak to your agency about the other nurse. The agency is liable for her conduct and she should not be helping out as a general aide. I, too have been in your situation and been able to make the boundaries clear, but didn't have someone else undoing it when I wasn't there. I didn't have a problem helping my client with tasks and facilitating communication for her, but no involvement with other kids except as a visitor to the class. Good Luck, these are challenging but rewarding positions. Also, keep in my mind that if you do homecare with these kids you are expected to perform non-nursing tasks such as meal prep and laundry. You have to work all this out for yourself so that you maintain professionalism.