What is the risk of harm to Christian in the context of travel costs?

This benefit must be balanced against the risk of harm to Christian on the totality of the evidence before me. This is not an exact science. As stated by R. Spence J., It is clearly impossible to quantify the risk of harm in percentage terms. Nor do I think it is necessary to do so. In any such analysis, as the benefit increases, or the cost decreases, the more such a changing equation operates in favour of permitting the children to travel. On the other hand, as the risk increases, or the benefit decreases, the more likely a court would conclude that travel is not in the best interests of the children. (Hamid v. Mahmood, supra, at para. 32)