Yes, it's not same as living in separate province. Did he live in the same province for the most of the year 2024 ? Since you mentioned he was deployed since early December? If that's the case you can use the same address for him.
General rule:
- File your tax return based on your province of residence as of December 31
Exceptions for temporary relocations:
- If you've temporarily moved to another province, you may still be considered a resident of your home province
- This often applies to:
- Temporary job assignments
- Students studying in another province
How to determine your province of residence:
- Consider your residential ties
- Select the province where you have the most significant connections
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