Encourage positive interactions by helping siblings show kindness and affection to one another. Allow children times to work together on tasks they enjoy. Ask children to talk about good feelings that result when a child is helpful to a sibling. Let siblings select holiday and birthday presents for one another. Provide each child with an equal share of sincere compliments.
Every child needs the reassurance they are valued and loved by a parent.
Most importantly, remember that there are many benefits to sibling relationships. Young children learn to consider the wants and needs of others. Siblings learn to share objects and provide help, comfort and physical affection towards others. They also learn to communicate even through arguments. Parent's Magazine Press.