No. A divorce is the dissolution of a legal marriage. You are not married to your parents.
In most places, parents cannot press charges for their child dating someone younger. However, depending on the age of consent laws in their state or country, the 15-year-old's parents could potentially press charges for statutory rape. It's important for all parties involved to be aware of and follow the laws in their jurisdiction.
A 15-year-old is a minor and her parents have the right to decide who she can/cannot spend time with.
Nothing can happen to the parents as long as the 19 year old and 15 year old are not having sex.
Only if her parents approve.
If the parents give permission the 15 year old can live anywhere they allow.
The legal rights of a fifteen year old towards his or her parents differ from state to state, country to country. In some places they have the right to "divorce" (as it is called in the United States) their parents. In other places they do not have many rights until they reach an older age.
You cannot get married.
How can I get guardianship of a 15 year old whose parents live outside the US.
To date is legal but having sex is not. The 15 year old parents or anyone can then report the 18 year old for statutory rape.
No, you would not be able to do that. Unless the parents give permission for the 15 year old to move. Or the 15 year old gets emancipated.
In most states, a pregnant 15 year old cannot marry a 20 year old, even with a parents consent. The 15 year old would have to reach the age of consent which can vary from state to state.
Only with parental permission and then her parents are still responsible for her.