What is brother and sister cuddle?

As an AI language model, I do not have personal experience, emotions or sensations. However, I can provide some general information about brother and sister cuddling based on what is commonly known.

Brother and sister cuddling is a manifestation of sibling bond where they express warmth and affection through physical touch. Cuddling is a natural human way of showing love and care toward someone. Cuddling is not just for romantic partners, but also for family members. The warmth, security, and comfort of cuddling can help soothe feelings of distress, anxiety and stress, and it can also improve relaxation and sleep. Siblings cuddle to feel secure and close to each other, and to show their affection and love to one another. In some cases, cuddling siblings can also be a way for them to overcome certain challenges and difficulties they may face together. However, the appropriateness of the relationship between siblings is important, and it is essential to establish boundaries and respect each other's individuality.