State attorney try to contact me for a subpoena Domestic Violence & Civil Orders

I have a attorney trying to contact me to serve a subpoena. First of all I was a witness. This was a family dispute between a father in son that got way out of hand. I ended up being hit by a shovel (didn't press charges but filled out a report). Since then the 2 have made amends and all is well. I really don't want to get in this being that it's family and who wants to testify against family had I have known I didn't need to fill a report out I wouldn't have. So I guess my question is do I have a choice I'm calling the attorney back tomorrow and would like to know if I myself have rights. Can I say I want no part in this matter?