Slay the Gods: From the Start, I Called Her Mom. Am I Really a Baby Dragon?

In Slay the Gods, I Want a Connection to One of the Main Characters, Then to Be Forced to Join the Ancient God Cult

I'm looking for a story where the protagonist's brother or sister is part of the original main cast, something like Wang Mian, and the Ancient God Church threatens their life to force the protagonist to join. I read a book with a similar plot before and want to find more like it.