sisterbrother

Sisterbrother is a neologism formed by combining the words sister and brother. In current usage it can describe two related but distinct ideas: (1) a person who identifies with both sisterly and brotherly aspects, often within discussions of gender, and (2) a sibling relationship inclusive of a sister and a brother that is emphasized for cross‑gender solidarity or mutual support. It is not a formally recognized identity category or legal relation.

Etymology and spread: The term arose in online communities where people discuss gender-fluidity, nonbinary identities, and diverse family dynamics. Variants include sister-brother with a hyphen or as separate words. Usage varies by speaker and context, and some readers may find the term unfamiliar or confusing.

Identity usage: When used to describe a person, sisterbrother often signals flexibility in gender expression, embracing both feminine and masculine traits, or rejecting binary labels. It is typically self-described rather than imposed by others, and it appears mainly in personal, memoir, or fan discussions rather than in formal surveys or guidelines.

Relationship or fictional usage: In talking about families, fan media, or fiction, sisterbrother can describe a pairing or bond between a sister and a brother, focusing on shared values, camaraderie, or alliance across gender lines. It may appear in narratives that explore nontraditional family structures or character dynamics.

See also: Nonbinary, genderqueer, androgyny, sibling relationship, family.