I have an employee who is late almost every day, and does not follow what I ask her to do. The hang up is she is related to me. What can I do if I have repeatedly asked her to correct behavior and she doesnt?

I have an employee who is late almost every day, and does not follow what I ask her to do. The hang up is she is related to me. What can I do if I have repeatedly asked her to correct behavior and she doesnt?