You can do some research and learn how to respond to them differently, what you learn can actually help you when you come across others down the road that behave like your parents. If there are things that your parents say or do that trigger you, that means you need to work on that more so you learn how to grow out of that mindset. You don't have to sink into whatever role you had with them anymore, you can work on building some skills instead. After all, your parents are just people.