It sounds like an acrimonious divorce, lasting from 2005 - 2008, where custody was a major factor. It's not uncommon for parents who choose this path to hurl all sorts of false allegations against each other. There may have been a court ordered psychological evaluation of both parents to determine the best interests of the child. Given the father's comments about a psychological evaluation, it's possible that the report was highly critical of him. Did it come down to who could afford the better lawyer, was the psychologist biased towards mothers, was the father so distressed that he appeared incoherent and delusional? Who knows.
What we do know is that Bryer was raised by his mother and her new husband. He appeared to be a relatively happy child around the age of 8, and he was a suicidal murderer 10 years later.