There are plenty of filmmaking sibling duos out there – the Coen Brothers, the Dardenne brothers, the Wachowskis – but it’s rare for them to work completely independently of each other.
In 2008, playwright Martin McDonagh made his break into film with In Bruges, a dark comedy about two hitmen hiding out in the Medieval Flemish city; three years later, his brother John Michael McDonagh made his film debut in the form of The Guard, about a hedonistic but thoughtful Connemara constable.…