That's an unfortunately common occurrence when the police are brought in for crimes like this. Most sexual abuse is perpetrated by people who have a relationship with the victim, usually family. 1 in 5 women have been raped, a third of those women were raped between the ages of 11 and 17. 81% of women will experience some form of sexual harassment or assault in their lifetimes. Only 20-40% of rapes are reported to the police. Only about half of those result in arrest. 80% of the arrests are prosecuted. 58% of the prosecutions result in conviction. And 69% of the convicted offenders will serve time in jail/prison. So for every 100 rapists, about 3 of them will go to prison.

source 1 source 2

Other than losing his family, no. Nothing happened. The cops thought my sister was lying or there wasn't enough evidence.

I know why people are voting you down, but it's generally considered bad taste to ask details about sexual abuse. Giving details actually acts as a way for other pedophiles to get off.

I'll leave it vague but factual. He was babysitting her when she was young and he molested her. She told my sister about it and she called the cops. The police believed my father and made it a "he said she said" situation between my sister and father.