Yes.
Yes, they certainly can as long as they have consent. It does not relieve the parents of their responsibilities.
No, step parents do not have any legal rights to the kids.
no as after 17 you are legal to move out but this also depends on how old the man is. though this is in the UK not Texas,
Parents are responsible financially for a 17 year old in Michigan who voluntarily moves out of the house unless the teen is completely emancipated. Teens can be partially emancipated, which means parents can still be responsible for certain things.
The 17-year-old's parents are probably responsible for supporting the 17-year-old (it may depend on the state and the exact circumstances). They are not responsible for supporting the 17-year-old's infant, nor should they be.
Yes, if they have parental permission. That does not relieve the parents of their responsibilities.
Until they reach the age of majority, the parents are still responsible for the child. They get to determine where they can live and can report them as a runaway.
IF the girl is not married, parents are responsible for her until she turns 18; No matter where she lives, unless she has been emancipated.
Yes. It does not relieve the parents of their responsibilities. And it does not give her the right to contract.
Probably not much would happen. However, they could be returned to their parents home.
They become parents of the child. And have all the responsibilities of having a child, including child support.