There is always a special relationship between siblings. I remember the ways I used to annoy my own brothers and sisters to get them going. My mom would always tells us to stop annoying one another, and would try to get us to cultivate more of a loving relationship.
To help cultivate your children to have a loving relationship with another one check out Sibling Love Talk printable from. iMOM. This printable will help your children make conversation starters thinking about and how to be kinder to their siblings.