Can confirm. My parents never really said anything about stuff like that but I'd say I was considered the good child simply because as a second child, I had learnt how to misbehave without being caught and that inevitably pictured me as a good kid.

But what I could also add is that you shouldn't take these words too seriously. In the end my sister carried on with her life and is now equally considered as good as me. The sort of thoughts of which child is better are temporary and at any given point any parent could have them, but the fact remains that with time and as you progress, it won't matter to you or them anymore. I remember how nice my parents started to be towards my sister after they got grandkids from her. So just continue being you and don't worry about it.