When both people are able to claim the amount for an eligible dependent, you both have to decide on who is going to make the claim. If you are not able to agree, and you both make the claim, the Canada Revenue Agency will disallow it for both of you. Please refer to the following link for further clarification, https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...
