Will the school call CPS on me over what my 14 year old son is doing?

My boys are 14 and 13. They don't get along and my 14 year old son is a bit of a jerk. My 13 year old son has started telling his teacher that his brother bullies him and I've gotten calls from two of his teachers. I don't consider what's going on as bullying. I think he's just picking on him because that's what siblings do. One of his teachers today said my son has a lot of bruises from his older brother. I said "Did you not have siblings growing up?" Me and my sisters didn't get along and sometimes things got nasty. It's not like I just let him hurt his brother all the time but I do understand that that's just siblings. I did talk to my son about it and said I'll try to talk to his brother but when he's telling his teachers how he is it makes it come off like he's being abused. Now I'm worried. Can they call CPS on me for his brother who's barely a year older than him being a jerk? Would CPS even do anything if they did call?