I'm my dad's third-born and my mum's first-born xD Technically I'm the middle child with two older half-brothers and one younger sister, but I grew up with my sister so I feel like the older sibling if that makes any sense xD
I'm the youngest child and I don't really think that's going to be changing anytime soon. There is a 15 year age difference between me and my sister, who I stole the place of being the youngest from her. Honestly, I consider my two nieces and nephew to be my siblings more since there is less of an age difference between me and them. My oldest niece is only 5 years younger than me.
Yep, I'm in charge of my sister whenever I'm off work on occasion and help get her to school or her afternoon sports if my parents need the help. I even keep my brothers in check ((which is sad because there's 2 years separating the three of us)) when my parents are out of town so they don't party and burn the house down. :T
But I'm used to being the "babysitter" I'm the third oldest of my whole lot of 15 cousins. So the responsibilities have always seemed land on my shoulders to be the "respectable adult" since I was around 10.
well that's a har one seeing as you are considered a middle child if you are in-between the first and last child and I was one of the ones on the middle but to be technical I'm the fourth youngest. I was the seventh born out of ten.