Well while you ask, on the basis of the case R. v Brennan where a man abducted his own son willingly to live with his new family in Canada, with no other motive than wanting to be with his own son, he received 4 years because the mitigating circumstances showed a degree of planning and deceit.
This person did the same really, he took a willing partcipant abroad but his reasons were somehwat different. It still shows a similar degree of planning and deceit, therefore I'd say 6 years was not inappropriate