Every relationship needs clear boundaries, and this doesn’t become any less necessary just because somebody happens to be related to you. Personal space and time alone are things that everybody needs varying degrees of, and it is important for them to be respected by those around them.
When that doesn’t happen, it is understandable that tension can occur. Living with somebody, especially a family member, can only make this issue worse, and many people struggle with having the space that they need when they grow up with siblings.
While it is natural for younger brothers or sisters to look up to older ones, it is also vital that parents recognize that time apart can be just as important as time together. If this isn’t respected, nobody can be surprised when arguments and resentment occur. There is a difference between a close sibling relationship and creating an uncomfortable environment for the child who doesn’t feel like their needs are being met.