Another youngest child here. My sister is 6 1/2 years older than me, and my brother is 5 1/2 years older. My sister was quieter and less rambunctious than my brother and me. My brother and I got the most attention because of that, but my brother suffered more consequences than I did, especially from my father. I was a bit of a daddy's girl when I was a little kid. Later down the road, not so much. I believe we were all loved equally, but because my brother was the only boy, my mom gave him some "only boy" attention. Of us three, though, I was more the friend to my mother (in addition to child), than my siblings were, mostly because I was still around after they left. One advantage that I really had was that my parents had much more money during the period after my siblings left home. I benefited from that a bit, but I do believe my parents tried to be very fair, overall.

I did have issues with bipolar disorder as a teen, and was also more demanding in terms of hobbies, and other stuff.