Lior's mother, a rabbi, had everything to do with his success, even though the film doesn't touch much on this. She apparently spent much time with him in early childhood and gave him praise, feedback, inspiration, encouragement, love, understanding, and even wisdom. After her death, Lior continued to gain approval and inner rewards by 'davening' and becoming the "Little Rebbe"..a true son of his mother. This is not to say that Lior doesn't have a true spirituality, which is shown in his optimistic and loving nature.
I learned a lot about Down Syndrome from this film in addition to becoming, very briefly, a (viewing) member of a strong, close-knit family, both normal and abnormal at the same time. Very interesting and nicely done by the documentarian.