53 Sundays (now on Netflix) presents the burning question: How many bickering siblings does it take to change a lightbulb? That’s not a joke or a metaphor but a literalism in Spanish director Cesc Gay’s adaptation of his stage play of the same title. Carmen Machi and Javier Gutierrez lead the four-way ensemble in a three-act story that mostly plays out two people at a time in a single location, and the result is funny, prickly and ultimately gently poignant.