It isnt clear what you are asking advice for. Why dont your family like him? Are their reasons unresonable or is what they say true. It is important to have family support, and you dont want to loose your family. However, if you truly love him, and he loves you then im sure you can work it out. Hopefully your family will learn to love him to, if they see that he makes you happy. Its good that his family like you to and that you feel at home with them. But you do need your family. Do you get along with yout family apart from this issue?
As far as the pregnancy goes, its up to you how you deal with it. If you are ok with it, and he no longer has any feelings for her, then you should be fine.
Be careful, take things slowly and be mature about it.