I started calling them by their first name when I thought I was old/adult enough not to say mom and dad anymore. My sister does the same.

But this has also been different from every side of our family. I speak a T-V language so we have formal and informal. My father and all his family were formal with their parents. And my mother was informal with her parents. In the end, I went in between. I use informal with my parents and call them by their names.

My bother in law noted that and brought it up. Apparently, it's weird and disrespectful from his point of view. Yet, to me it's quite normal.

How can a 16 years old teenager feel comfortable saying "mom and dad"? To me, ditching those terms meant that I was not a child anymore.