The higher income earner can claim the child care expenses only if any situation in Part C or D of Line 21400 applies. When it refers to a period of 2 weeks, it means 2 consecutive weeks (2 weeks straight).
Information as per Canada Revenue Agency (CRA):
Line 21400 - Who can claim child care expenses? - Canada.ca
Child Care Expenses Deduction for 2021 (canada.ca)
Questions and answers about child care expenses - Canada.ca
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