Quoting from link below to answer your question.
"You can claim this amount for the full year, even if you met the eligibility criteria for only part of the year.
The amount for an eligible dependant cannot be split between two parents.
If you were separated from your spouse or common-law partner during the tax year because of a breakdown in your relationship, or if you share custody of your dependant child with the child’s other parent:
Here is the link for more information:
Who can claim the tax credit for an eligible dependant?joyce7788
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