Potentially testifying in a child abuse case but afraid for my personal safety, what to do?

My sister adopted 3 foster children and then went on to neglect and abuse them. Her son sexually abused them. The whole situation was awful from the beginning.

I called child welfare on them years ago which eventually led to the discovery of the sexual abuse (something I didn’t know was going on). The province is now at the point where they want to sever their parental rights. Because I hold a lot of information on what was going on they want me to testify. But I am terrified of my brother in law who is abundantly capable of violence and is furious child welfare got involved to begin with.

My husband doesn’t want me to testify. He’s worried about my safety and the safety of our family. I can understand that. BUT so many people have let these kids down and I can’t be one of them. Especially with what I know. Much of this knowledge came because of direct conversations I had with my sister and me seeing what was going on.

I know going and testifying is the right thing to do. How do I make myself safe? How do I convince my husband?

it seems that my life has been an endless string of drama