there's actually rules to being emancipated first you have to have a means of support and parental concent and you have to be 16 so if the 15 year old is getting abused he should contact the authorities
Yes. You have to have parental consent to be legally emancipated, unless you are being mentally/emotionally abused, physically abused, or their living arrangements are unstable.
I personally think you could if she allows you to. But I'm not so sure about the welfare without being emancipated.
of course of course
No.
No.
No.
Yes, she could be emancipated, but if the parents give permission (normally required for emancipation anyway) she can move in without being emancipated.
Mental abuse is hard to prove, but if you feel strongly about it contact the department of children's services or child welfare. Call 911 and go through the police if you're not sure how.
It will depend on the state or country they are in. It is possible in some places, and at a minimum, the court will move them to foster care.
No.
about 3,750 animals get abused every year in Switzerland
With parental permission, yes.