Have her jailed on statutory rape charges.
have him/her charged as a runaway.
yeah
With his parents' permission he can live anywhere.
No. Parents decide where she would live and if this means you are having sex it is illegal.
Yes but they can not have sex until she is 17.
Yes.
{| |- | No they really cannot make that choice. Until they are adults a 16 year old remains the responsibility of their parents. That includes the parents determining where thay can live. |}
In the US I would be careful to live as an 16 year old with an 18 year old without the permission of the parents. The parents can get him sentenced when they want to and that is all legal - see Megan´s Law.
If you were keeping her there against her will or lying to the police if they ask you if she is with you.
No, your girlfriend can't leave home. Yes, you do have to have parents consent to marry. Since you are an adult and she is a minor the parents can also file rape charges against you for "dating" a minor.
Yes. Even if you are with her and her parents, an 18 year old can get in toruble for that.
no by cali laws- you would be considered a runaway
Minors can only move with their parents consent.