My family is abusive towards me, and I am 16 years old

My family (Mother, Father, Elder Sister) are currently and have been extremely neglectful and abusive towards me for my entire life. My parents have not been physically violent towards me, however they have been violent towards my sister. My sister has Narcissitic Personality Disorder (Clinically Diagnosed) and she cannot see anyone else happy (that is not an exaggeration, it is her mindset). She has destroyed a lot of my belongings including an iPad, multiple expensive perfumes, and multiple expensive pens. My parents have not done anything about it, despite me telling them numerous times. They only listen to her, and they keep trying to take away my freedom. Their marital issues also come in between our relationship. I want to know if there is any law under which I can sue them, if it comes to that. I want to know what laws I can sue them for emotional abuse and neglect under. I have video and audio evidence of my sister abusing me, and I am collecting evidence of my parents abusing me. We are well-settled and I will be able to secretly arrange money to hire a lawyer.