DSS has been coming to see my siblings

I noticed since the beginning of the year my mom has been going through the biggest depression it has jeapodize my siblings lives. There age is 7, 6, and 5. She doesn't want me to help her, cause I'm pregnant currently 28 weeks, 21 years old, and it's my last year at the University. She admit she a bit jealous of me and doesn't want me to be involved in her problems cause she feels embarrassed, and doesn't want me to stress about. But I been very involved in my siblings lives since day one of their lives. Yesterday I walked into my mom house and the atmosphere was very depressing my dad constantly puts my mom down. I had just arrived and my mom said he was going to buy a pizza, and he never showed up with th pizza!! Poor kids were hungry lucky I had food for everyone. Yari don't eat pizza so, we went out to eat. She told me that mom hasn't been cooking and how happy she is be eating. Which broke my heart. She calls me on my mom phone randomly to say hi, she is the oldest of the younger siblings. It breaks my heart that they are kept indoors like animals. I left home at 17 for the same reason because I wanted to be free! If DSS takes my siblings away I will take them into my house in a heart beat. All are suffering from emotional problems cause my dad traumatizes them. He is a very cold man, he shows them attention, then he leaves them crying not even given a care in the world and I want to scream at him to HUG THEM! He is an unsupportive father! I blame him for everything that he puts my mom through emotionally and finically. I want an intervention. I just want the best for my siblings !