>>113241712We find out that Rose/Pink is still alive. She faked her death (again) after giving birth to Steven because she likes to have fun and didn't want to be tied down by motherhood. This works because originally Rose/Pink was made to be this amazing person but as the series has progress, we slowly find out that isn't the case.
This triggers Steve into his corruption mode and basically fights his mom due to him being so POed at her for all the crap she has pulled.
Eventually fight is stopped by a little girl who turns out to be Nora, Stevens little half sister.
Steven realizes his mom is who she is, and that he doesn't have to be like her, and accepts this.
Somehow it's decided that Nora will stay with Steven because Pink/Rose is too carefree to actually take care of her. So once that's decided Pink/Rose leaves to go around the world and have fun again.
Steven finds a new purpose in life in being a big brother to Nora and teaching her how to use her gem powers.