If your son was a resident of British Columbia on December 31, 2022, but lived in Alberta for 6 months in 2022, then you would report his residency as British Columbia for tax purposes.
Individuals are considered residents of the province or territory where they have significant residential ties, such as a permanent home, dependents, or personal property. Based on this definition, it appears that your son's significant residential ties were in British Columbia, even though he spent 6 months living in Alberta for hockey.
For more information please see Canada Revenue Agency(CRA) Website. Your province or territory of residence
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