Why did my music change back to my dads?

My siblings and I used to be on my dads apple ID but he wanted us to have our own. My dad has a subscription to apple music so when we got our own apple IDs he did family sharing. I had my own music and so did my siblings and my dad. we all had our own playlists. One day I went into my music and I saw all my dads playlists and lost mine. I’m not sure what happened but I can’t find anything that will help. If anyone has an idea of what to do please help.