Forced to be a parent to my siblings because my parents are neglectful.

I have two younger sister one is a teenager and the other is a seven year old. My parents who are in their 50’s don’t even know what my 13 year old sister does online or what she’s exposed to or who she talks to. She just asks for a phone and they give it to her. They let my 7 year old sister use electronics (she has both an iPhone and ipad) to the point where she forgets to drink water or eat.

I keep bringing it up to them and they get defensive like “what the fuck do you want me to do? Beat them?” I’m their older sister and I try my best but I’m also busy with college. They tend to take me less serious because I’m not their mom or dad.

I try to distract them from time to time from their electronics but it doesn’t work in the long term.

What should I do?