Reading the rest of your comment sounds like me growing up. I was IN CHARGE of my siblings, even if my parents were home. I did baths and homework on nights my mom worked and my dad was home. I was only 2 years older than my brother and 7 years older than my sister. I remember having to take my brother to school when he was in 2nd grade(so I would've been 4th), kicking and screaming, because he hated his teacher. Literally dragging him behind me as we walked and my parents were at work.
Alot of my "issues" with so much responsibility so young definitely affected how I parented my DD and her "responsibilities" growing up. (she's an only so no siblings to have to worry about.)