Cps investigation

So there’s this mom and dad with 2 young boys. The police and cps are being involved now. There’s been 2 police reports(1 for the dad abusing the oldest, dad smashed youngest boys in the door) and how mom is being abused which is 100% true she’s my sister. The second one is for the dad starving the mom, locking her inside the apartment, won’t leave) and same thing as cps. Well she lied to cps and the social worker knows it too because the social worker talked to our mom about their marriage, abuse. She told my mom “I know your daughter is withholding Information” and my mom said “yeah she’s afraid for her life” and how they were good before they got married but now they aren’t. My sister is freaking out and didn’t know what to do her husband told her to lie about it all or he will kill her and other things. What could happen now? Don’t judge my sister, she’s trying to get out, and she’s been trying since June.