Severing ties

Hi

My 17 year old daughter fell pregnant. She was in a 9 month relationship with an 18 year old. He spoke to me about marrying her before she fell pregnant, late last year, I told him them to wait until she finished her final year at school. Anyway I found out that she was pregnant in February, she was very emotional round about that time, and I could hear that their relationship was not on a sound footing anymore. She told me that she was pregnant because he was pressuring her to have an abortion. Both his family and ours are quite orthodox muslims, so it would be important to understand the content within the context of our community. According to her, he accepted the news but later started pushing her away, and cutting conversation short. When his parents found out they came to see us. It would have been customary to get married but he refused to do so. My husband told his parents that if he didn't want to marry her, he should stay away. He wanted the families to cut ties. His parents were very upset, they explained how attached they were to my daughter and how they wanted to support her. We then agreed that they would be welcome to enquire about my daughter and to come and see the baby when it is born. Since then the boy have tried on a few occassions to make contact and get their relationship back on track but each time they get to a point where he needs to commit he backs off, or starts an argument with her to break the relationship. She has last spoken to him almost 2 months ago. His mother continues to phone to find out about my daughter but after each call , she becomes sad, angry and frustrated. My husband and daughter now wants to sever ties with his family. I have been the one who has been accommodating and diplomatic about the whole thing. My daughter feels I'm putting their needs before hers. She doesn't want them to contribute towards the baby in anyway, she just wants them to leave her alone. How do I let them know that my family wants to sever ties? They want to be a part of the baby's life, but my daughter feels that since he went on with his life they should all just leave her alone.