My partner's daughter is awful...anyone in the same boat?

He is a lovely dad but as single father of two girls a bit overprotective. The 16 yo gives him orders, hangs up on him, won't let him know where she is, calls him at any time of night that suits her, 2 3 am to be picked up and fished out of some funny situations, every weekend is out all night, comes home drunk. Her mother has had to call the police several times in the last few weeks. I have a NAUSEA. My son would not DREAM of speaking to me that way, or anyone. My partner is a good may but he is unable to set boundaries with the girls. The 16 yo is also a lovely girl in many ways, but she worries me a great deal. In any case, I am not having in my home this level of disrespect, and I don't know how to help my partner. We stay together most evenings and nights but I told him I wanted to be by myself for a while to think about the situation. We love each other and are very committed. But I very simply don't want anyone to come in my home and speak to me or my partner or anyone of my family in her manner, or lie, or hang up, or come home drunk every weekend - I would not take it from my own son, and am not willing to take it from his daughter. Should I say this clearly to him? I don't want to lose him. Anyone been there? What's the right thing to do? Thanks