The police is tricky, at least in my home state of CT you have to deal with statutes of limitation. Sadly, most States do not provide protection beyond a finite period after the abuse. I see you are in NYC and the NY State has been working for years to extend the statute of limitations without much success. I caution you about family, some are wonderful but look back on their history-- approach with caution. If they were truly good people then go for it. I learned in therapy and support the warning signs that I should have seen when I told of my abuse-- Please think deeply before telling family.
After living with initial treatment from family, I told several other family members and they were wonderful. An aunt my marriage always said my father's family could have arguments, not like what someone did but half hour later they would be laughing about, no grudges, just family.
Initial familiar treatment pushed me to people who knew love, compassion and did not hide behind their false world--they are the happiest people and most welcoming people--I am thankful for them because they rescued me many times. Telling the right people can rescue a survivor and provide a path to a happy life.