sister and brother
It is two persons of the opposite sex who are always there for each other. They can not even be related but trust each other anyways as if they were 'brother and sister' These 2 persons can never lose faith in each other because they will need each other. In one way or another they will always love each other no matter what, and no one can separate them.
I love have a sister and brother relationship.
Big Sisters & Big Brothers
Organizations that pair young kids with older "brothers" & "sisters". They spend quality time together & it makes up for not having a Mom or Dad. Great for youngsters!
{Big Sisters & Big Brothers are in practically every town & city nationwide.
Sister/brother/cousins
When sisters share a baby daddy their offspring would be sister/brother/cousins.
Or if a brothers have the same baby mama their offspring would also be sister/brother/cousins.
Or if a brothers have the same baby mama their offspring would also be sister/brother/cousins.
We not just cousins, we sister/brother/cousins.