It takes a while for that feeling to go, it’s totally normal for you to feel this way. I felt so confused at first, missed him dreadfully despite being terrified of him which logically makes no sense but that’s what trauma bonding is.
Allow yourself to feel those feelings of missing him without acting on it. As you know acting on it will just continue the abuse cycle.
It’s kind of like an addiction. They get us addicted to them through intermittent reinforcement and the mean sweet cycle and it’s painful getting used to life without them because of this.
I’m sorry about your family member, do you have any other support? Can you do something nice to remember this person for yourself and them like a nice walk somewhere you both liked? It helps a lot to focus on your own life, friends, job, goals, family, hobbies etc as it takes the focus off the abuser. It’s v hard but it does get easier.