BROTHERHOOD
Broth"er*hood, n. Etym: [Brother + -hood.]

1. The state of being brothers or a brother.

2. An association for any purpose, as a society of monks; a fraternity.

3. The whole body of persons engaged in the same business, — especially those of the same profession; as, the legal or medical brotherhood.

4. Persons, and, poetically, things, of a like kind. A brotherhood of venerable trees. Wordsworth.

Syn.
— Fraternity; association; fellowship; sodality.

BROTHER-IN-LAW
Broth"er-in-law`, n.; pl. Brothers-in-law (.

Defn: The brother of one's husband or wife; also, the husband of one's sister; sometimes, the husband of one's wife's sister.

BROTHERLINESS
Broth"er*li*ness, n.

Defn: The state or quality of being brotherly.