CRA pays them on family net income from the base year (as for the Canada Child Benefit).
Yukon child benefit
$80.50 a month for each child under 18, less 5% a year of family income over $35,000 (2.5% with one child). A parent with shared custody gets half the difference the shared children make. It comes with the CCB each month.[1]
What it does not do
The Pioneer Utility Grant and the Yukon Seniors Income Supplement are applied for from the territory and are not modelled. See income tax in Yukon.