Fraternal (adjective)

1. Relating to or resembling a brother or brothers.
2. Having the relationship of brothers; brotherly.
3. Having or arising from a close relationship based on common interests, aims, or experience.
4. Relating to a society or club for men founded on the principles of friendship and mutual support.

Origin:

Late middle english: from old french fraternel, from latin fraternus, from frater "brother".

Examples:

1. The fraternal bond between the two brothers was unbreakable.
2. The fraternal organization provided support and assistance to its members.
3. The fraternal feeling between the team members was evident in their strong bond.
4. The fraternal relationship between the two friends was based on a deep understanding of each other.
5. The fraternal love between the siblings was obvious in the way they looked out for each other.