Sometimes humans can get really violent. I once body slammed my sister after a series of punches to her chest and then put her in a head lock.
On another occasion I remember tieing her to a chair and threating her to push her into the water drain ravine in our backyard.
A similar incident happened when I dropped kicked her off our porch. When she fell I jumped down beside her and threated to punt her head into the wall.
Not to be competitive, purposely aggressive, or a bully.
Younger siblings can be very difficult especially when they are immune to a sense of danger.