Inevitably, families fall apart. Not all of them out of malice or spite, but more because of time and growth. At the very core of raising a family is the idea that someday you will watch your children leave you, and this, of course, will upend the very thing you have been trying to hold together for so many years. But what happens when that upending moment comes early, when the eldest on his way out the door is only 16 years old, but the opportunity he’s granted is once in a lifetime? This is the question at the heart of “Loveling,” a small-scale family drama from Brazil that suffers under the weight of its lack of narrative ambition and uneven quality, despite the revelatory performances at its core.