A similar question has already been answered by me at the link: Married man in live in relation with unmarried woman – legal provision. Please read that.
Moreover, another part of your question is covered in the answer at: Freedom from parental detainment and legal provision of live in relationship.
Please do not ask academic questions, as this Forum is meant only for replying to questions of those who are actually facing real legal problems. It is not meant for answering academic queries.
Dr. Ashok Dhamija is a New Delhi based Supreme Court Advocate and author of law books. Read more about him by clicking here. List of his Forum Replies. List of his other articles. List of his Quora Answers. List of his YouTube Videos.