If any of her family comes to see her, you will be greatly treasured if you allow them to stay in the home. Instruct your nanny thoroughly about any security precautions you take in the home. Nanny should never let in repairmen etc. without your prior approval. Tell the nanny who is coming and when. If someone shows up unexpectedly, Nanny should call you at your place of work before letting them in.
Most nannies are young women.
They may be sensitive to kidding and certainly any mockery. The very best relationships develop when people take the time to communicate. Encourage your nanny to discuss working conditions with you if something seems amiss. A smart employer will schedule a time when there are no interruptions from children or others so that the employer and employee may freely communicate. Take your nanny out for ice cream after dinner once in awhile, if not for a full course meal.