What is the test for an order to transfer custody from one parent to the other?

In Williamson v. Williamson, 2016 BCCA 87, our Court of Appeal has emphasized that: • alienation is a serious allegation and its existence and root caused must be proved by appropriate expert evidence; • such expert evidence is also required respecting alternative remedies appropriate in any individual case as being in the best interests of the child, in the short and the long term; and • draconian orders such as transferring custody from the alienating parent to the rejected parent must not be made without careful consideration whether the long-term benefits will actually outweigh any short-term emotional trauma to the child.