There have been many movies made about parenting, but few dare to explore the near powerlessness of the lifelong endeavor. “Birthmarked” takes a scientific view of nature vs. nurture behavior, but co-writer/director Emanuel Hoss-Desmarais is quick to expose the fantastic physical and emotional drain of raising children, using such fatigue to generate a darkly funny and passably warmish exploration of guardianship as it begins with clinical study and ends in an emotional mess. “Birthmarked” is rather insightful when it comes to the struggles of parental control and funny about the emergence of personality, funneled into mildly quirky, appealingly strange tale that feels a little dramatically wobbly as the story unfolds, but sustains its unusual perspective on a bizarre domestic battle.  Read the rest at Blu-ray.com