She can't. If there is abuse, report it. The 15 year old can at least get out of the home until she is legal and can get married (at 18 years of age).
No. There are only a few things that a child can do without parents' consent, and moving in with a boyfriend is not one of them.
Your 18 year old boyfriend pretty much has to consent, or there's no marriage. If you're underage, you must obtain the consent of your parents or legal guardians (or, in some places, a court). No one else can do this, and very specifically your boyfriend cannot.
There could be problems. The age of consent in California is 18. Yes, he can be charged with sexual crimes.
No. And the boyfriend's parents could very well find themselves facing criminal charges for taking her in.
Only with parental consent.
No.
You can not move out before 18 without parental consent and you can not legally have sex with your boyfriend until you are 17, which is the age of consent in NYC.
What do you mean by how? You have parental consent and you are also age of consent so you can just move.
He needs parental consent to move out until he is 18.
Parental permission is important and a key factor. However, part of it will depend on the boyfriend as well. Technically, she is under the age of consent, and therefore sexual contact could be a crime. And the parents cannot consent to a crime.
If the crush is above the age of consent, but she did not consent to the sex (or if she were unconscious) the young man will be charged with "rape".If the crush is below the age of consent, and she did not consent (or was unconscious), the young man will probably be looking at "aggravated rape".If the crush is below the age of consent, but she did consent to the sex, the young man may be charged with "statutory rape".If the crush is above the age of consent, and she did consent to the sex, no crime has been committed.The fact that she has a boyfriend is irrelevant.-Additional circumstances may constitute additional charges.
Not in the United States. A minor requires parental consent.