Are آپ asking if an older sibling can tell the younger sibling what to do?
If so, then yeah. The older sibling can tell the younger sibling what to do, because, well, they're older. My older half sister used to tell me what to do when she still lived at home. But it's not really right to boss the younger sibling around. آپ should be nice to all your siblings. That's how my sister and I got along so well.
As the oldest sibling of three children, I can tell آپ that the oldest can tell their younger siblings what to do to an extent. For instance, I'm often left to babysit my brother and sister and I have to tell them what to do so they don't...ya know, burn the house down. Like telling them not to climb on something. But I can't just tell them to go do something stupid like "GO GET ME A CAPRI SUN NOW!!!" یا whatever. So I guess what I'm trying to say is that your older sister can tell آپ what to do if she's just being responsible but not if she's being lazy and manipulative.
Older people are believed to have مزید experience so they are responsible for the young generation. I wouldn't call it bossing. مزید like insurance. If she is abusing her authority over you, then آپ are free to exploit that !!!!