Can I claim my brother who resides in Canada as my dependent? I support his college tuition and living expenses.

You would need to have him apply for a social security number in order to claim him and meet the following requirements.

You can claim a child, relative, friend, fiancé (etc.) as a dependent on your 2019 taxes as long as they meet all of the following requirements :

• You provided more than half of their financial support. More info
• They made less than $4,200 in gross income during 2019 
• They live with you for all 12 months. (See this article for more information on “relatives who do not live with you” in Publication 501.) 
• They are a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
• They aren't (or won't be) claimed as a dependent by someone else.
• They aren’t filing a joint return with their spouse.
• You are not being claimed as a dependent on someone else's return.