Pep Costa knows from experience that relationships between brothers and sisters can be difficult to explain. Words don’t suffice because they fail to highlight the nuances, the codes, the ins and outs over the years, and that’s why it’s better to keep quiet and carry on. His older sisters Eva and Sara — the twins — are always fighting and haven’t even spoken to each other in years. But Eva, always temperamental, has an emergency which forces her to visit Sara, and this time it falls on Pep to mediate. It’s September 2007 and a countdown starts that could change everything. 'The Sky Is Not For Everyone' recreates four decades of the subtle game that is family life, complete with its crashes.