What makes a family? That question is at the heart of Sundance Channel’s film offerings this week. Is it the assumed acceptance of a wife who clearly does not fit into her married family (JUNEBUG)? Or that last, dearest connection to a beloved pet, when all other strings have frayed away (WENDY AND LUCY)? What about the complex machinations of an intellectual family dealing with the dissolution of a marriage (THE SQUID AND THE WHALE)? It’s all these things and more.