Hello! My daughter recently got pregnant and decided to terminate the pregnancy about 2 weeks ago. (we have respected her choice although it was very hard.) She has been with her boyfriend for about a year and we are meeting him for the first time soon, as he is coming to stay with us for 4 days.
We already let him know we want to discuss the matter with him because we are very concerned about how much he cares about her. He has cheated and given her an std once before and obviously they do not have safe sex or a healthy relationship. Any advice on how to have a productive discussion and questions would be so helpful!
LemonVibe 
If she is a adult you can talk to her about her concerns, but be careful not to alienate her and make sure she knows that she has a place to go to if this doesn’t work out. She is a adult who can chose how she deals with her own issues and body.
I do not recommend talking to him at all. That will definitely alienate them.
Good luck and I’m sorry your family is going through this.