The father sought costs of $33,000 following his successful motion to change regarding primary care and child support.
The mother argued for no costs or a reduced amount based on her inability to pay.
The court found the father was successful on the most contentious issues and that the mother engaged in unreasonable litigation behaviour.
The court ordered the mother to pay the father $18,000 in costs, with $3,600 attributed to child support for enforcement through the Family Responsibility Office.