I have 4 younger siblings. (Step-brother the same age, bio sister 2 years younger, and step-siblings that are appx, 10 years younger). We lived in the same house together about half the time.
My youngest brother did have it a little easier from my parents but not from us siblings. (Then again he had three older sisters and a big brother.) We tortured him.
I think the middle child gets it the easiest because they become invisible. My biological sister was in the middle and she could get away with practically anything as long as she kept her room clean. I on the other hand had to grow up way too fast to take care of everyone.
My youngest siblings had to grow up pretty quick because they were expected to act like us older siblings. They knew what was expected of them and it was difficult for them to live up to it. (Especially since I was a straight A student.)
But this is all just the perspective of the oldest sibling.