|1.||family with benefits|
Similar to friends with benefits, a family with benefits is a group of friends that are close enough to be called a family and have a relationship characterized by random hookups between many/all of the members. The relationship is fucked up, but it works... somehow.
"Did you hear Mary slept with Paul and Rob last weekend?"
"Damn, that girl is definitely bringing this family with benefits closer together!"
|2.||family with benefits|
mother: Hey son, wanna blowjob.
son: Cool. Family with benefits.
father: Let me git the video camera.